I connected my two PC's with crossover Lan cable. Everything is set just fine. I've set each IP adress manually. Ping is OK, I can normally transfer data between each other.
But, when I tried to join a multiplayer game(the other PC is host), LFS says that I haven't entered valid IP adress.

Any ideas why? It's making me crazy...

For LAN connection, you need to use one of the IP address ranges reserved for LAN use.

For example 192.168.xxx.xxx

Hmmm.

Well if you both can see yourselves over the local network, all the host computer would need to do is start a Local game, and the client connects to the correct IP. It is strange this wouldn't work.

What are the IPs you are using, and do you perhaps have port 63392 open on any firewalls? (Don't know if that matters)

EDIT: Yes like Scawen says, you need a LAN IP, which is why I ask.

In demo mode it works with any IP though

Quote from Scawen :

For LAN connection, you need to use one of the IP address ranges reserved for LAN use.

For example 192.168.xxx.xxx

Orion was right, IP adresses I had before(192.0.0.2 & 192.0.0.3) were OK for demo connection and regulary work in windows, but not for S1 or S2.

Now both of my IP's start with 192.168 as you suggested and now it's working on all versions.

Thanks guys!