Help Cant connect to server

I was just on the server and then we changed the map and now i cant join

Commencing connection retry to
Connecting to…
LAN servers are restricted to local clients (class C).

The server is probably in sv_lan mode, as in only people connected to the box via Local Area Network.

Yes its [L]Sandbox

But i was JUST on it

They wanted to start a lan party, so they changed sv_lan to 1 and restarted the map.