Not able to connect to Left4Dead 2 server

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OS Name/Version:
Ubuntu 22.04
Product Name/Version: (Always use the full version number - not ‘Latest’)
AMP Release Phobos 2.6.1

Problem Description:

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Steps to reproduce:

  • Launch Steam
  • Browse for l4d2 server either via lan, wan or add to favorites
  • Server not found

Actions taken to resolve so far:
Telnet to server with port 27015 to confirm listening
Netstat on server to see port listening
Set to lan mode to try browsing lan via steam

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