My friends can't join my server if the map is big

[Beelzebubbles]

Hello.
We're a bunch of people who wants to play on a 2048x2048 map. We've all tried hosting the server, but we can't join the person hosting if the map is bigger than 1024x512. It loads around 1mb each time before we get a cannot connect message. We've tried the same setup on lan and it works fine. We can join other peoples servers on the internet.
Any ideas on how I can make this work?

[Eddi]

you need to change the connection timeouts in the config file on the server.

[Beelzebubbles]

Thanks a bunch.