Thanks for your reply, Kevinz.
I'm sorry I didn't write this at the first place.
Internet availability is OK, dashboard is accessible, but neorouter fails.
I turned firewall off - no effect.
Checked antivirus (it's a simple one, without any firewalls in it), then turned off, still without positive result
I tried to install neorouter server at my home computer (w7x64), in the same network as my test server. Worked fine, but I didn't check it with enabled firewall, I doubt it matters.
I'll try to check if it works with w2k3x86 tomorrow.
But still - it's strange. As I said, it worked at first server, but broke after reinstall. Neorouter was the only thing I reinstalled
Do you have any ideas where to look next?