If your IW4x server list remains empty:
You can, but only within the client. Press ~ to open the console and type: iw4x server list exclusive
connect 192.168.1.100:28960
However, the server will not appear in external browsers, and the connection will fail if: If your IW4x server list remains empty: You
To ensure you are ready to join these exclusive servers, follow this checklist: However, the server will not appear in external