Cisco Anyconnect Vpn Unsuccessful Domain Name Resolution

This is what the AnyConnect client will look like when it is connected. It is an icon in the system tray of your PC. While the VPN client is connected, you should be.

Cisco AnyConnect: The VPN connection failed due to unsuccessful domain name resolution. 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.

Mar 17, 2021 If you received 'VPN connection failed due to unsuccessful domain name resolution' when using Cisco AnyConnect Secure Mobility Client, here's how to fix it. 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.

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You are trying to connect to MIT's VPN on vpn.mit.edu, but get an error:

The VPN connection failed due to unsuccessful domain name resolution.

Answer

First, make sure that the problem only affects the Cisco VPN. Test vpn.mit.edu with other tools such as a web browser, or 'ping' the hostname.

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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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.