I've an odd one. I have a windows 2003 server machine that is configured for a LAN (10.1.134.?/24). From the machine, I can interact with the network (internet browsing, pinging, etc), but I can't contact it from another machine on the LAN. The windows firewall is not enabled (by default).
I used nmap to scan open ports on the machine and nmap just sits and spins. The switch infrastructure knows the system exists (arp tables are populated).
It's behaving as if the system will not respond to anything it didn't initiate.
I've switch network cables, network interfaces (there are two interfaces on the system),ports on the switch it's connected to, connected to a different switch. I've connected it and another system to a dumb, isolated switch and that doesn't work.
I've also set it up to used dhcp. It successfully receives configureation information fro the dhcp server, but behaves the same as static settings.
I'm not even sure where to start looking (aside from the network configuration which appears to be fine).
Any pointers would be appreciated.