Cisco Anyconnect Vpn Unsuccessful Domain Name Resolution



You will see that Cisco Anyconnect displays an error message where it is not able to connect to the VPN host using the hostname. The first thing you will need to confirm is if the DNS resolution is working and in order to confirm that you will need to run the command prompt. solved Troubleshooting Cisco ISE Fast User Switching in Cisco AnyConnect NAM Module/no logon server is available (9,552) Recent Posts solved how to decommission an Azure AD connect server for Office365. The Basic Facts of the Vpn Connection Failed Due to Unsuccessful Domain Name Resolution If you discover that there isn’t a neighborhood cache already, add a DNS cache to every Linux VM. After failover, the customer remains connected to the exact physical server.

[solved] how to resolve the Cisco Anyconnect error message “VPN connection failed due to unsuccessful domain name resolution”

The above message is a very common message caused by the local internet provider DNS resolution failure and cane be fixed very easily.

below is the error message that you may get when trying to connect to the VPN while connected to the home internet.

Anyconnect

Cisco Anyconnect Vpn Unsuccessful Domain Name Resolution System

You will see that Cisco Anyconnect displays an error message where it is not able to connect to the VPN host using the hostname.

The first thing you will need to confirm is if the DNS resolution is working and in order to confirm that you will need to run the command prompt.

Launch the command prompt by going “start” “run” type “cmd” – see the screenshot for reference.

You can test the resolution by pinging espn.com.

  1. type “ping” and you can see Ping espn.com is not resolving.
  2. nslookup for cnn.com does not resolve and shows a loop back address as a dns server.

One good place to see more logs is by going to the gear icon on the Cisco Anyconnect. see the screenshot below for reference.

Go to the VPN tab and message history and you can see how many times, the client tried to connect and failed..

Start the command prompt again to test the DNS resolution.

This time use the DNS lookup using the google DNS server and you will see a response and that confirms that is the DNS server.

Vpn Domain Name Resolution Error

You can update the DNS server by manually adding the google DNS server for a temporary fix until your internet provider fixes the issue.

ResolutionCisco anyconnect vpn unsuccessful domain name resolution errorAuthenticationCisco anyconnect vpn unsuccessful domain name resolution problems

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You are trying to connect to MIT's VPN, but get an error:

The VPN connection failed due to unsuccessful domain name resolution.

Answer

The cause is not fully known, but this is seen more frequently when people are using Google Public DNS (DNS servers 8.8.8.8 and 8.8.4.4)

  • Try using another DNS server, such as your ISP's DNS server
  • Try sending some pings to vpn.mit.edu before connecting; these can help cache the IP address in your DNS cache.
  • Wait a few minutes and try connecting again; the connection can work if you try again later.
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