Cisco Anyconnect Does Not Connect

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Cisco anyconnect not working

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?
Solved:

I am using a MacBook Pro and Cisco's AnyConnect VPN v3.0575. I am the only one in the office out of dozens of users not able to connect to the VPN. IT has checked my laptop and said the problem is something in the Verizon network or router blocking me. I am using the Actiontec MI424-WR, Rev E FiOS router. I am using AnyConnect VPN with Windows 10 to connect to my corporate network and it works fine. I would like to be able to connect to the corporate VPN via Ubuntu 20.10 as well (on VMWare Workstation 16 Player), currently not working properly, it looks like a DNS problem.

Problem

Problem

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.

Cisco AnyConnect VPN Client

Cisco anyconnect internet not working

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 ASA 5500 Series Adaptive Security Appliances

  • 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.