I've been an IT professional for county government over 2 1/2 years and this problem has occurred 3 times. I can fix it by restarting the primary server, but I would like to fix it without having to take that route. Here's the situation. On our primary server (from here on out called Server1) we have software running called Springbrook (fund accounting and utility billing enterprise software). The users access Springbrook via mapped drives to Server1. I place shortcut on their desktops that pulls the software from the mapped drive. Sometimes, I don't know why, 3 or more users lose access to Server1, which causes them to lose access to Springbrook. The rest of us can still access Server1. By losing access to Server1 I mean PC A cannot ping, RD to, or access shares on Server1. Ping tells me the remote host is unreachable, RD gives the same message, and when I try to explore the mapped drive the message tells me the network path is not available. If I restart Server1 then those 3 users can suddenly access Server1 again.
I assume the only thing happening is that a network service is restarting, but I don't know if it's the NetLogon service, an AD service, or it may be something else I'm not aware of. Restarting the users' PCs doesn't solve the problem. Nor does rejoining the PC to the domain fix the issue; it's always restarting Server1 that fixes the issue.
This doesn't happen often. Like I said, in the 2 1/2 years I've been here it's happened 3 times. Out of those 3 times it hasn't been the same PCs either. I would like to know how to prevent it or at least how to fix it without restarting the server completely.
AD domain. Windows Server 2008 R2 server. Sonicwall TZ210 firewall. Netgear 24 port gig switch. PCs hook into Netgear gig 5 port switches.
EDIT: Thanks for the answers so far. Poor question writing on my part. I failed to mention that the affected PCs can communicate with other PCs on the network, even Server2 (we have to DCs). Server1 can't ping to the affected PCs either.