![]() ![]() If inaccessible, you could have a firewall or NSG blocking access to DNS, or it could be down. You can't use nslookup because that doesn't use the DNS your virtual network is configured with. Use nameresolver to see if the DNS is working. If you have two DNS servers, the timeout is six seconds. The DNS timeout is three seconds per DNS server. TCP timeouts can be caused by many things beyond firewalls, but start there. Use the tcpping tool to test connectivity. The TCP timeout is 21 seconds in this case. If you have a firewall in the way, you hit the TCP timeout. Most of the time, it's one of the following: The syntax is: curl -v curl hostname:ĭebug access to virtual network-hosted resourcesĪ number of factors can prevent your app from reaching a specific host and port. To test connectivity, you can use the Curl command. ![]() The nameresolver.exe tool currently doesn't work in Linux apps. You can see the DNS server that your app uses in the console by looking at the environmental variables WEBSITE_DNS_SERVER and WEBSITE_DNS_ALT_SERVER. This way, you can test if you have anything misconfigured with your DNS or perhaps don't have access to your DNS server. You can use nameresolver to check the hostnames that your app depends on. The syntax is: nameresolver.exe hostname To test DNS functionality, you can use nameresolver.exe. In native Windows Apps, the tools ping, nslookup, and tracert won't work through the console because of security constraints (they work in custom Windows Containers). Troubleshoot outbound connectivity on Windows Apps Once we've established that the virtual network integration is configured successfully, we can proceed with the connectivity test. Linux OS-based apps set| egrep -color 'WEBSITE_PRIVATE_IP'Ĭheck the private IP in the Kudu environment If the private IP is assigned successfully, you'll get the following output: WEBSITE_PRIVATE_IP= Windows OS-based apps SET WEBSITE_PRIVATE_IP In the Debug console, run one of the following commands: You can also go to the Kudu Debug console directly by the URL. In the Kudu service page, select Tools > Debug Console > CMD. To access the Kudu console, select the app service in the Azure portal, go to Development Tools, select Advanced Tools, and then select Go. To do this, use one of the following methods: Check the private IP in the Kudu Debug console To troubleshoot the connection issues, you must first verify whether the virtual network integration is configured correctly and whether the private IP is assigned to all instances of the App Service Plan. Access restriction policies are ignored if a private endpoint is present. Virtual network integration isn't supported for Docker Compose scenarios in App Service.
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