2 posts tagged with "vpn"

A VPN (Virtual Private Network) works by creating a secure, encrypted connection (often called a "tunnel") between your device and a VPN server. Here’s how it works step by step:

Comprehensive guide to fix WSL2 and Cisco AnyConnect VPN internet connectivity issues.

There is a known issue with DNS forwarding in WSL2 and WSL1 when using VPN (see GitHub Issue #1350). Additionally, there are specific problems with Cisco AnyConnect VPN client. This guide provides workarounds for these issues and should work for Ubuntu and Debian distributions.

The Problem - Common Symptoms​

When connected to Cisco AnyConnect VPN, you may encounter the following DNS resolution failures:

• Package updates fail - sudo apt update displays errors like:

Err:1 http://archive.ubuntu.com/ubuntu focal-updates InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Err:2 http://archive.ubuntu.com/ubuntu focal-backports InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal/InRelease  Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-updates/InRelease  Temporary failure resolving 'archive.ubuntu.com'

• Git operations fail - git pull displays errors like:

// code-block-error-line
fatal: unable to access 'https://github.com/actionanand/wiki.git/': Could not resolve host: github.com

• Network connectivity fails - ping google.com displays:

ping: google.com: Temporary failure in name resolution