I was getting a heavy desync with my server. I restarted the server and the desync is still there. I also changed some network settings in simuconf.tab and the desync was still crazy. Then in desperate, I manually type the IP address of the server, and lo, I almost got no desync, even with crazy building activity.
Does DNS server usage really have some effect with desync? Does Simutrans calls the DNS server everytime?
Oh, I almost forget. I also can't reach my server from simutrans using twelveserver.twilightparadox.com:13355, even though it is pointed to my server.