You can't connect via ip in bo1, you need to use the session id. You can get that by going here: https://plutonium.pw/api/servers
Look for your server and then look for the key labeled "id".
connect 3497239723972784
If that works your issue is that your router doesn't support nat loopback, other people outside of your lan will see the server in the list.
If that doesn't work then packets can't get through to your server so it's an issue with port forwarding/firewall/occupied ports.