'The VPN connection failed due to unsuccessful domain name resolution'. Type the domain name of your anyconnect vpn host. See if it resolves the actual IP address as expected. Get the user to perhaps also tether through their mobiles to check as well. My Cisco certificate expires in 3 months from now and I need to get 40 CEs in order. This is the root cause of your issue. It looks like you are not using your domain controller as a preferred DNS server while connected to VPN. It makes you not able to join the domain since proper domain name resolution using the domain controller is one of the major requirements for the domain join procedure to go successfully.
This article refers to the Cisco AnyConnect VPN. If you're looking for information on the Prisma Access VPN Beta that uses the GobalConnect app, see: Prisma Access VPN Landing Page. If you're not sure which service you're using, see: How do I know if I'm using the Cisco AnyConnect VPN or the Prisma Access VPN? |
Problem
![Cisco Cisco](/uploads/1/1/7/6/117649109/418912483.jpg)
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.
Solution
First, make sure that the problem only affects the Cisco VPN app. Test vpn.mit.edu with other tools such as a web browser, or 'ping' the hostname.
![Domain name resolution cisco anyconnect Domain name resolution cisco anyconnect](/uploads/1/1/7/6/117649109/665612365.png)
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)
Cisco Anyconnect Profile Windows 10
- 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.