Im trying to access my VANILLA server without localhost (localhost works fine) but when I play on the server after typing the IP instead of localhost, the server becomes laggy and I am logged out with the erro "Internal Exception: io.netty.handler.timeout.ReadTimeoutException"
Is there a solution?
This is probably because it's going through your router, thus a technical support issue. That's just speculation, however. For technical support please use the Mojang Support Center.