Dns probe finished
Author: f | 2025-04-24
This is what the browser or search engine means by DNS PROBE FINISHED NXDOMAIN. Today, let’s see if we can solve this problem. Fixing the DNS PROBE FINISHED NXDOMAIN Error Tired of 'DNS Probe Finished Bad Config' Error ? Watch the video till end and learn How to Fix DNS Probe Finished Bad Config on Windows in a simple and eas
Troubleshooting the DNS PROBE FINISHED
A disabilitarlo temporaneamente (chiudendolo) per vedere se risolve l’errore DNS probe finished nxdomain in Chrome.6. Controllare il File Host LocaleOgni computer ha il cosiddetto file host locale. Si tratta di un file che contiene voci DNS manuali mappate a indirizzi IP specifici. In genere viene modificato solo quando si vuole avere un’anteprima del DNS prima di passare i domini a un nuovo host.Tuttavia, ci sono molti modi diversi in cui questo file potrebbe essere stato modificato. Pertanto, se nessuna delle opzioni precedenti ha funzionato, vale la pena fare un double-check del file hosts locale per verificare che il sito web a cui state cercando di accedere non sia presente.WindowsIl file hosts richiede in genere un accesso supplementare. Quindi il primo passo è aprire il vostro editor di testo come amministratore. Cliccate sul menu Start, cercate il vostro editor di testo, fate clic con il tasto destro del mouse e selezionate “Esegui come amministratore”. Questo può essere fatto con qualsiasi editor di testo come Notepad, Notepad++, Atom, ecc. Nell’esempio che segue utilizziamo Sublime.Eseguire l’editor di testo come amministratoreAll’interno dell’editor di testo, cliccate su File → Apri e cercate il seguente percorso:C:WindowsSystem32driversetcCliccate sul file hosts e su “Apri”.Aprire il file hostsControllate che il sito web che state cercando di visitare non sia presente nell’elenco. Se lo è, rimuovetelo.MacPer controllare il vostro file host su Mac, vi consigliamo di procurarvi Gas Mask. Si tratta di un’applicazione gratuita che può essere utilizzata come gestore di file host, editor di file host e passare da uno all’altro. Rende tutto più facile e veloce! Altrimenti, potete seguire i prossimi passaggi per modificare manualmente il vostro file hosts su Mac.Andate su Utilità e poi cliccate su “Terminale”.Mac terminalInserite il seguente comando e premete Invio (molto probabilmente vi verrà richiesta anche la password di amministratore).sudo nano /private/etc/hostsFile Hosts
DNS PROBE FINISHED NXDOMAIN Message
LANIf you run PRTG as a cluster and you want to run remote probes outside your local network, you must make sure that your cluster nodes and the addresses that they use are reachable from the outside. Check your cluster node settings under Cluster before you install a remote probe outside your local network. Enter valid Domain Name System (DNS) names or IP addresses for both cluster nodes to reach each other and for remote probes to individually reach all cluster nodes. Remote probes outside your LAN cannot connect to your cluster nodes if they use local addresses.If you already have a remote probe installed outside your LAN and the remote probe is disconnected because of this, follow these steps:Uninstall the remote probe.Update the cluster node settings with addresses that are reachable from outside your LAN.Restart the PRTG core servers.Install the remote probe again. It then obtains the IP address or DNS name entries that it can reach.See also section Failover Cluster Configuration, section Remote Probes in a Cluster.Step 3: Configure the Failover NodeIf you have not yet done so, add a device that represents the target system on which you want to install the remote probe. Set the correct Windows credentials for this device.Open the device settings.In the Credentials for Windows Systems section, provide Domain or Computer Name, User Name, and Password for the target system. You can also inherit the credentials from the settings of a parent object in the device tree.Make sure that this user account has administration rights on the target system.Step 4: Confirm the Failover NodeIn the device tree, open the context menu of the target device.Select Device Tools | Install Remote Probe to open the install dialog in a new window.This option is only available for devices on the local probe of PRTG Network Monitor.Remote Probe Installation DialogThe install dialog includes four sections:Experimental feature notice and short introductionDetails: Overview of the device like Device Name, Status, Priority, Parent Probe, Parent Group, and Sensors by Status.Prerequisites: Make sure that you meet the requirements listed here. If not, PRTG cannot start the installation process. Open requirements are highlighted in red.Installation Unable to Start Because Prerequisites Are Not MetStart Probe Installation: Time estimation for the installation and installation start buttonIf all prerequisites are met, you can install the remote probe on the target system by clicking Install Remote Probe on "[device name]". Wait until the process hasDNS PROBE FINISHED NO INTERNETAuslogics Blog
BASE + 1; /** * Inform ConnectivityService that the network has been tested. * obj = String representing URL that Internet probe was redirect to, if it was redirected. * arg1 = One of the NETWORK_TESTED_RESULT_* constants. * arg2 = NetID. */ public static final int EVENT_NETWORK_TESTED = BASE + 2; /** * Message to self indicating it's time to evaluate a network's connectivity. * arg1 = Token to ignore old messages. */ private static final int CMD_REEVALUATE = BASE + 6; /** * Inform NetworkMonitor that the network has disconnected. */ public static final int CMD_NETWORK_DISCONNECTED = BASE + 7; /** * Force evaluation even if it has succeeded in the past. * arg1 = UID responsible for requesting this reeval. Will be billed for data. */ private static final int CMD_FORCE_REEVALUATION = BASE + 8; /** * Message to self indicating captive portal app finished. * arg1 = one of: APP_RETURN_DISMISSED, * APP_RETURN_UNWANTED, * APP_RETURN_WANTED_AS_IS * obj = mCaptivePortalLoggedInResponseToken as String */ private static final int CMD_CAPTIVE_PORTAL_APP_FINISHED = BASE + 9; /** * Request ConnectivityService display provisioning notification. * arg1 = Whether to make the notification visible. * arg2 = NetID. * obj = Intent to be launched when notification selected by user, null if !arg1. */ public static final int EVENT_PROVISIONING_NOTIFICATION = BASE + 10; /** * Message indicating sign-in app should be launched. * Sent by mLaunchCaptivePortalAppBroadcastReceiver when the * user touches the sign in notification, or sent by * ConnectivityService when the user touches the "sign into * network" button in the wifi access point detail page. */ public static final int CMD_LAUNCH_CAPTIVE_PORTAL_APP = BASE + 11; /** * Retest network to see if captive portal is still in place. * arg1 = UID responsible for requesting this reeval. Will be billed for data. * 0 indicates self-initiated, so nobody to blame. */ private static final int CMD_CAPTIVE_PORTAL_RECHECK = BASE + 12; /** * ConnectivityService notifies NetworkMonitor of settings changes to * Private DNS. If a DNS resolution is required, e.g. for DNS-over-TLS in * strict mode, then an event is sent back to ConnectivityService with the * result of the resolution attempt. * * A separate message is used to trigger (re)evaluation of the Private DNS * configuration, so that the message can be handled as needed in different * states, including being ignored until after an ongoing captive portal * validation phase is completed. */ private static final int CMD_PRIVATE_DNS_SETTINGS_CHANGED = BASE + 13; public static final int EVENT_PRIVATE_DNS_CONFIG_RESOLVED = BASE + 14; private static final int CMD_EVALUATE_PRIVATE_DNS = BASE + 15; // Start mReevaluateDelayMs at this value and double. private static final int INITIAL_REEVALUATE_DELAY_MS = 1000; private static final int MAX_REEVALUATE_DELAY_MS = 10*60*1000; // Before network has been evaluated this many times, ignore repeated reevaluate requests. private static final int IGNORE_REEVALUATE_ATTEMPTS = 5; private int mReevaluateToken = 0; private static final int NO_UID = 0; private static final int INVALID_UID = -1; private int mUidResponsibleForReeval = INVALID_UID; // Stop blaming UID that. This is what the browser or search engine means by DNS PROBE FINISHED NXDOMAIN. Today, let’s see if we can solve this problem. Fixing the DNS PROBE FINISHED NXDOMAIN ErrorHow to fix DNS PROBE FINISHED NO INTERNET
Failure to adjust the configuration of these solutions before employing the VAs may result in the complete ineffectiveness of the VAs and Umbrella. For more information, see Using Umbrella with an HTTP Proxy. Solutions include:Transparent HTTP/HTTPS ProxyStandard/Caching HTTP/HTTPS ProxyContent Filtering via a hardware applianceDNSCryptThe VA supports DNSCrypt between itself and the Cisco public DNS resolvers (Umbrella). This means any information contained in the EDNS packets forwarded from the VA are encrypted by DNSCrypt and cannot be intercepted. For optimum protection, this feature is enabled by default.Unencrypted traffic is considered a problem that should be resolved. When encryption cannot be established between your VA and the Cisco DNS service, your dashboard displays a warning. Encryption is established with a probe sent on port 53 (UDP/TCP) to 208.67.220.220 and 208.67.222.222 and if you have a firewall or IPS/IDS doing deep packet inspection and expecting to see only DNS traffic, the probe may fail. If the probe fails, it is retried on 443 (UDP/TCP) and then on 5353 (UDP). In other words, the encrypted packets may not match the expected traffic on that port. Review your firewall configuration if that is the case and open a case with Support if you believe that you are allowing this traffic.Introduction < Prerequisites > Deployment Guidelines" data-testid="RDMD">Virtual Appliance RequirementsNetworking RequirementsDNSCryptTwo virtual appliances (VAs) per Umbrella site—VAs must be deployed in pairs to ensure redundancy at the DNS level and to allow for updates without downtime.VA Specifications—At a minimum, each VA requires the following allocated resources:One virtual CPUMinimum 512MB of RAM (1GB RAM recommended)7GB of disk space.Each VA is able to process millions of DNS requests per day using these specifications. If you believe your network will exceed this number, see Sizing Guide.🚧ImportantHigh-traffic site VAs should use two virtual CPUs and 2048MB of RAM per VA.A high-traffic site is one that has more than 500 DNS queries per second coming from the overall network.Download a fresh image for each deployment—You need to download a fresh image from Umbrella for each deployment, and when there is a new version. For security reasons, Umbrella periodically changes the Org Token Secret, requiring you to use an image less than 24 hours old. Also, the Virtual Appliance may not register correctly with the Umbrella dashboard if you are using an older version. See, Umbrella Virtual Appliance and Active Directory Connector: Download and deploy.Correct Date/Time—Ensure your hypervisor host has the correct dateHow to fix the error DNS PROBE FINISHED NO
Allow or allow-nat network address translation (NAT) rule that enables a remote probe to reach the PRTG core server via the Transmission Control Protocol (TCP) port 23560. Then, the remote probe uses a dynamic port from the high port range (49152 - 65535) for outgoing connections.For remote probe connections to PRTG Hosted Monitor instances, the above also applies with the main difference that you only have to configure the remote probe side so that the outgoing connection to your PRTG Hosted Monitor (DNS name or underlying IP address) is possible and is reachable under this specific port.If you run PRTG in a cluster, remote probes also connect to all cluster nodes and send monitoring data. This works as described above for a single PRTG core server. If the master node fails, you can still see monitoring data on the failover nodes. You can define the Cluster Connectivity of each probe in the probe's settings, section Administrative Probe Settings.Automatic Probe UpdateWhenever you install a new version of PRTG on the PRTG core server, all classic remote probes automatically download and install the updated version as soon as they reconnect to the updated PRTG core server.PRTG does not automatically update multi-platform probes. If you installed a multi-platform probe via the Paessler Linux package repository, your package manager notifies you when there is an update. Otherwise, manually update your multi-platform probes with the updated package. For more information, see the manual: Multi-Platform Probe for PRTG.PRTG updates the local probe when you update theFix: DNS Probe Finished No Internet - TechColleague
The VA.The tunnel must be established by the customer to the Cisco support team.For more information, see On-Demand Tech Support SSH Tunnel for Virtual Appliances.Intrusion Protection Systems (IPS) and Deep Packet Inspection (DPI)—If utilizing an IPS or DPI, ensure that traffic on port 53 TCP/UDP to and from the VAs is excluded from packet inspection, as Umbrella's DNS encryption methods might be flagged and dropped. If the VAs cannot successfully send and receive encrypted DNS packets, Umbrella displays a warning in the dashboard.Network Address Translation (NAT)—If a routing device running a separate NAT is placed between endpoints and VAs, an endpoint's IP address will show as the NAT device's IP address in the dashboard. The endpoints must reach the VAs without being subjected to a separate NAT. If you are unable to remove a routing device with a separate NAT, you may have to run a separate set of VAs within that NAT. If you have any questions regarding this matter, contact Support.HTTP Proxies / Content Filtering—Most solutions attempting to locally proxy, cache, or filter HTTP/HTTPS traffic between an endpoint and the internet require additional configuration in order to work in unison with VAs. Failure to adjust the configuration of these solutions before employing the VAs may result in the complete ineffectiveness of the VAs and Umbrella. For more information, see Using Umbrella with an HTTP Proxy. Solutions include:Transparent HTTP/HTTPS ProxyStandard/Caching HTTP/HTTPS ProxyContent Filtering via a hardware applianceThe VA supports DNSCrypt between itself and the Cisco public DNS resolvers (Umbrella). This means any information contained in the EDNS packets forwarded from the VA are encrypted by DNSCrypt and cannot be intercepted. For optimum protection, this feature is enabled by default.Unencrypted traffic is considered a problem that should be resolved. When encryption cannot be established between your VA and the Cisco DNS service, your dashboard displays a warning. Encryption is established with a probe sent on port 53 (UDP/TCP) to 208.67.220.220 and 208.67.222.222 and if you have a firewall or IPS/IDS doing deep packet inspection and expecting to see only DNS traffic, the probe may fail. If the probe fails, it is retried on 443 (UDP/TCP) and then on 5353 (UDP). In other words, the encrypted packets may not match the expected traffic on that port. Review your firewall configuration if that is the case and open a case with Support if you believe that you are allowing this traffic.Introduction PrerequisitesDNS probe finished no internet - Apple Community
DNS Probe ]: Performs a DNS lookup request and resolved IP address to test DNS connection.DNS Probe Max Failures: If DNS resolution fails or returns the wrong address to n times, then it is assumed that the internet connection is completely unsuccessful.(d11) Additional pppd options: This item may be specified by some ISPs. Check with your ISP and fill them in if required.e. Special Requirement from ISP(e1) VPN Server: If your WAN connection type is PPTP or L2TP, please enter the server name or server IP of the VPN Server.(e2) Host Name: You can provide a host name for your router. It’s usually requested by your Internet Service Provider (ISP).(e3) MAC Address: MAC(Media Access Control) address is a unique identifier that identifies your computer or device in the network. ISPs monitor the MAC addresses of devices that connect to their services, and would disallow Internet Connection for new MAC addresses. To fix this issue, you can do either of the following: * Contact your Internet Service Provider (ISP) and request to update the MAC address associated with your ISP subscription. * Clone or change the MAC address of the new device to match the MAC address of the original device.(e4) Extend the TTL value: The default is [ No ].(e5) Spoof LAN TTL value: The default is [ No ].L2TPa. Basic Config(a1) Enable WAN: Enable and disable WAN. Under some connection types, you can get a new IP address by using Enable and Disable WAN.(a2) Enable NAT: NAT(Network Address Translation). This is what the browser or search engine means by DNS PROBE FINISHED NXDOMAIN. Today, let’s see if we can solve this problem. Fixing the DNS PROBE FINISHED NXDOMAIN Error Tired of 'DNS Probe Finished Bad Config' Error ? Watch the video till end and learn How to Fix DNS Probe Finished Bad Config on Windows in a simple and eas
Troubleshooting the DNS PROBE FINISHED NXDOMAIN Error
Reviving a valid LCP Echo-Reply. Use of this option requires a non-zero value for the Echo Interval parameter.[ DNS Probe ]: Performs a DNS lookup request and resolved IP address to test DNS connection.DNS Probe Max Failures: If DNS resolution fails or returns the wrong address to n times, then it is assumed that the internet connection is completely unsuccessful.(d11) Additional pppd options: This item may be specified by some ISPs. Check with your ISP and fill them in if required.e. Special Requirement from ISP(e1) VPN Server: If your WAN connection type is PPTP or L2TP, please enter the server name or server IP of the VPN Server.(e2) Host Name: You can provide a host name for your router. It’s usually requested by your Internet Service Provider (ISP).(e3) MAC Address: MAC(Media Access Control) address is a unique identifier that identifies your computer or device in the network. ISPs monitor the MAC addresses of devices that connect to their services, and would disallow Internet Connection for new MAC addresses. To fix this issue, you can do either of the following: * Contact your Internet Service Provider (ISP) and request to update the MAC address associated with your ISP subscription. * Clone or change the MAC address of the new device to match the MAC address of the original device.(e4) Extend the TTL value: The default is [ No ].(e5) Spoof LAN TTL value: The default is [ No ].FAQ1. Port Forwarding only works within the internal network/intranet(LAN) but cannot be accessedDNS PROBE FINISHED NO INTERNET - Microsoft Community
Blackbox exporterThe blackbox exporter allows blackbox probing of endpoints overHTTP, HTTPS, DNS, TCP, ICMP and gRPC.Running this softwareFrom binariesDownload the most suitable binary from the releases tabThen:">./blackbox_exporter Using the docker imageNote: You may want to enable ipv6 in your docker configurationdocker run --rm \ -p 9115/tcp \ --name blackbox_exporter \ -v $(pwd):/config \ quay.io/prometheus/blackbox-exporter:latest --config.file=/config/blackbox.ymlChecking the resultsVisiting return metrics for a HTTP probe against google.com. The probe_successmetric indicates if the probe succeeded. Adding a debug=true parameterwill return debug information for that probe.Metrics concerning the operation of the exporter itself are available at theendpoint and basic authenticationThe Blackbox Exporter supports TLS and basic authentication. This enables bettercontrol of the various HTTP endpoints.To use TLS and/or basic authentication, you need to pass a configuration fileusing the --web.config.file parameter. The format of the file is describedin the exporter-toolkit repository.Note that the TLS and basic authentication settings affect all HTTP endpoints:/metrics for scraping, /probe for probing, and the web UI.Building the softwareLocal BuildBuilding with DockerAfter a successful local build:docker build -t blackbox_exporter .ConfigurationBlackbox exporter is configured via a configuration file and command-line flags (such as what configuration file to load, what port to listen on, and the logging format and level).Blackbox exporter can reload its configuration file at runtime. If the new configuration is not well-formed, the changes will not be applied.A configuration reload is triggered by sending a SIGHUP to the Blackbox exporter process or by sending a HTTP POST request to the /-/reload endpoint.To view all available command-line flags, run ./blackbox_exporter -h.To specify which configuration file to load, use the --config.file flag.Additionally, an example configuration is also available.HTTP, HTTPS (via the http prober), DNS, TCP socket, ICMP and gRPC (see permissions section) are currently supported.Additional modules can be defined to meet your needs.The timeout of each probe is automatically determined from the. This is what the browser or search engine means by DNS PROBE FINISHED NXDOMAIN. Today, let’s see if we can solve this problem. Fixing the DNS PROBE FINISHED NXDOMAIN Error Tired of 'DNS Probe Finished Bad Config' Error ? Watch the video till end and learn How to Fix DNS Probe Finished Bad Config on Windows in a simple and easFix: DNS PROBE FINISHED NXDOMAIN Error in
You to configure to terminate your Internet Service Provider (ISP) connection after a specified period of time. A value of zero allows infinite idle time.(d5) MTU: The Maximum Transmission Unit(MTU) of PPPoE packet. The default value is 1492. Change this value only if your Internet Service Provider (ISP) requires it.(d6) MRU: The Maximum Receive Unit(MRU) of PPPoE packet. The default value is 1492. Change this value only if your Internet Service Provider (ISP) requires it.(d7) Service Name: This field is optional and may be specified by some ISPs. Check with your ISP and fill them in if required.(d8) Access Concentrator Name: This field is optional and may be specified by some ISPs. Check with your Internet Service Provider (ISP) and fill them in if required.(d9) Host-Uniq (Hexadecimal): This item may be specified by some ISPs. Check with your Internet Service Provider (ISP) and fill them in if required.(d10) Internet Detection: Options are [ Disable ], [ PPP Echo ], [ DNS Probe ][ Disable ]: Disable it to turn of Internet Detection.[ PPP Echo ]: Use Echo-Request and Echo-Reply message defined in PPP Link Control Protocol(LCP) to test the PPP connection.PPP Echo Interval: Send an LCP Echo-Request frame to the peer every n seconds.PPP Echo Max Failures: Presume the peer to be dead if n LCP Echo- Requests are sent without reviving a valid LCP Echo-Reply. Use of this option requires a non-zero value for the Echo Interval parameter.[ DNS Probe ]: Performs a DNS lookup request and resolved IPComments
A disabilitarlo temporaneamente (chiudendolo) per vedere se risolve l’errore DNS probe finished nxdomain in Chrome.6. Controllare il File Host LocaleOgni computer ha il cosiddetto file host locale. Si tratta di un file che contiene voci DNS manuali mappate a indirizzi IP specifici. In genere viene modificato solo quando si vuole avere un’anteprima del DNS prima di passare i domini a un nuovo host.Tuttavia, ci sono molti modi diversi in cui questo file potrebbe essere stato modificato. Pertanto, se nessuna delle opzioni precedenti ha funzionato, vale la pena fare un double-check del file hosts locale per verificare che il sito web a cui state cercando di accedere non sia presente.WindowsIl file hosts richiede in genere un accesso supplementare. Quindi il primo passo è aprire il vostro editor di testo come amministratore. Cliccate sul menu Start, cercate il vostro editor di testo, fate clic con il tasto destro del mouse e selezionate “Esegui come amministratore”. Questo può essere fatto con qualsiasi editor di testo come Notepad, Notepad++, Atom, ecc. Nell’esempio che segue utilizziamo Sublime.Eseguire l’editor di testo come amministratoreAll’interno dell’editor di testo, cliccate su File → Apri e cercate il seguente percorso:C:WindowsSystem32driversetcCliccate sul file hosts e su “Apri”.Aprire il file hostsControllate che il sito web che state cercando di visitare non sia presente nell’elenco. Se lo è, rimuovetelo.MacPer controllare il vostro file host su Mac, vi consigliamo di procurarvi Gas Mask. Si tratta di un’applicazione gratuita che può essere utilizzata come gestore di file host, editor di file host e passare da uno all’altro. Rende tutto più facile e veloce! Altrimenti, potete seguire i prossimi passaggi per modificare manualmente il vostro file hosts su Mac.Andate su Utilità e poi cliccate su “Terminale”.Mac terminalInserite il seguente comando e premete Invio (molto probabilmente vi verrà richiesta anche la password di amministratore).sudo nano /private/etc/hostsFile Hosts
2025-04-18LANIf you run PRTG as a cluster and you want to run remote probes outside your local network, you must make sure that your cluster nodes and the addresses that they use are reachable from the outside. Check your cluster node settings under Cluster before you install a remote probe outside your local network. Enter valid Domain Name System (DNS) names or IP addresses for both cluster nodes to reach each other and for remote probes to individually reach all cluster nodes. Remote probes outside your LAN cannot connect to your cluster nodes if they use local addresses.If you already have a remote probe installed outside your LAN and the remote probe is disconnected because of this, follow these steps:Uninstall the remote probe.Update the cluster node settings with addresses that are reachable from outside your LAN.Restart the PRTG core servers.Install the remote probe again. It then obtains the IP address or DNS name entries that it can reach.See also section Failover Cluster Configuration, section Remote Probes in a Cluster.Step 3: Configure the Failover NodeIf you have not yet done so, add a device that represents the target system on which you want to install the remote probe. Set the correct Windows credentials for this device.Open the device settings.In the Credentials for Windows Systems section, provide Domain or Computer Name, User Name, and Password for the target system. You can also inherit the credentials from the settings of a parent object in the device tree.Make sure that this user account has administration rights on the target system.Step 4: Confirm the Failover NodeIn the device tree, open the context menu of the target device.Select Device Tools | Install Remote Probe to open the install dialog in a new window.This option is only available for devices on the local probe of PRTG Network Monitor.Remote Probe Installation DialogThe install dialog includes four sections:Experimental feature notice and short introductionDetails: Overview of the device like Device Name, Status, Priority, Parent Probe, Parent Group, and Sensors by Status.Prerequisites: Make sure that you meet the requirements listed here. If not, PRTG cannot start the installation process. Open requirements are highlighted in red.Installation Unable to Start Because Prerequisites Are Not MetStart Probe Installation: Time estimation for the installation and installation start buttonIf all prerequisites are met, you can install the remote probe on the target system by clicking Install Remote Probe on "[device name]". Wait until the process has
2025-04-18Failure to adjust the configuration of these solutions before employing the VAs may result in the complete ineffectiveness of the VAs and Umbrella. For more information, see Using Umbrella with an HTTP Proxy. Solutions include:Transparent HTTP/HTTPS ProxyStandard/Caching HTTP/HTTPS ProxyContent Filtering via a hardware applianceDNSCryptThe VA supports DNSCrypt between itself and the Cisco public DNS resolvers (Umbrella). This means any information contained in the EDNS packets forwarded from the VA are encrypted by DNSCrypt and cannot be intercepted. For optimum protection, this feature is enabled by default.Unencrypted traffic is considered a problem that should be resolved. When encryption cannot be established between your VA and the Cisco DNS service, your dashboard displays a warning. Encryption is established with a probe sent on port 53 (UDP/TCP) to 208.67.220.220 and 208.67.222.222 and if you have a firewall or IPS/IDS doing deep packet inspection and expecting to see only DNS traffic, the probe may fail. If the probe fails, it is retried on 443 (UDP/TCP) and then on 5353 (UDP). In other words, the encrypted packets may not match the expected traffic on that port. Review your firewall configuration if that is the case and open a case with Support if you believe that you are allowing this traffic.Introduction < Prerequisites > Deployment Guidelines" data-testid="RDMD">Virtual Appliance RequirementsNetworking RequirementsDNSCryptTwo virtual appliances (VAs) per Umbrella site—VAs must be deployed in pairs to ensure redundancy at the DNS level and to allow for updates without downtime.VA Specifications—At a minimum, each VA requires the following allocated resources:One virtual CPUMinimum 512MB of RAM (1GB RAM recommended)7GB of disk space.Each VA is able to process millions of DNS requests per day using these specifications. If you believe your network will exceed this number, see Sizing Guide.🚧ImportantHigh-traffic site VAs should use two virtual CPUs and 2048MB of RAM per VA.A high-traffic site is one that has more than 500 DNS queries per second coming from the overall network.Download a fresh image for each deployment—You need to download a fresh image from Umbrella for each deployment, and when there is a new version. For security reasons, Umbrella periodically changes the Org Token Secret, requiring you to use an image less than 24 hours old. Also, the Virtual Appliance may not register correctly with the Umbrella dashboard if you are using an older version. See, Umbrella Virtual Appliance and Active Directory Connector: Download and deploy.Correct Date/Time—Ensure your hypervisor host has the correct date
2025-03-31