Click on the “ Firewall & Network Protection” option and select the “ Allow an App through Firewall” button.Click on the “ Updates & Security” option and select the “ Windows Security” from the left pane.Click on the start menu and select the “ Settings” icon.Therefore, in this step, we will be allowing the app through the firewall. Sometimes the Windows Firewall blocks certain elements of the game from making contact with the server. It is recommended for you to try these solutions in the specific order in which they are displayed in order to avoid any conflicts. Now that you have a basic understanding of the nature of the issue we will move on towards the solutions. the game will not function properly if the Update has not been installed on the computer. Updates: It is possible that the game has not been updated and that there is an update available for the game.If a certain file is missing or has gone corrupt the game will not work properly and cause issues with the launch process. Missing Files: The game requires all of its files to be present and intact in order for all of its elements to function correctly.

Antivirus/Firewall: If you are using a third-party antivirus software especially the “AVG Antivirus” or the default Windows 10 Firewall there is a chance that they blocked certain elements of the game from making contact with the server or deleted important files from the game directory.

Gmod file is corrupt