Why am I hitting "Error 12007"?
Error 12007 indicates that the server name or address could not be resolved. If you get this error while starting or joining a session, it is usually caused by the network security.
Check your firewall allowlist
If you or your company uses firewall allowlisting to restrict network access to only specific websites or software, check our Optimal Firewall Configuration article to ensure there is no missing allowlisting and that your service can connect.