I have a weird issue that popped up on our network.
Once or twice a week a user (it's always a different user) would complain about not being able to communicate to our Small Business Server 2003 that handles Exchange, DNS and file sharing, essentially cutting the machine off from any sort of network communication.
When I check the ARP table on that particular server there is a static ARP entry mapped to the IP address of the workstation in question with a completely different MAC address. If I manually delete the static entry the machine is back online. The weird thing is that it's always a different machine that has this problem.
For the life of me I can't figure out what's setting these static ARP entries on the server and forcing me every time to go in and remove it manually to bring the workstation back online.
Our environment is fairly small (20 workstations and 2 servers).
Any help is appreciated.