A customer's servers (SBS2011 and Server 2008 R2) sometimes stop showing up in the network browse list.
All workstations are Windows 7 Pro or ultimate 64bit.
You can still access the servers by manually typing in \\SERVERNAME in the search box.
Mapped drives stay mapped.
All internal firewalls have been disabled or turned off.
One minute, you will open Explorer, and click Network, and see a complete list of all workstations and servers. Then, at a random time, you open explorer and click network, and all you can see are the workstations.
When running a net view command on the command prompt, if the servers are not showing up in explorer, you get "Operating system error 71.
No more connections can be made to this remote computer at this time because there are already as many connections as the computer can accept. "
I have tried stopping and disabling Computer Browser service on both servers and workstations - no effect.
All computers have network Discovery set to ON.
On the SBS2011 server, the BPA shows no problems.
DCDIAG shows all tests passed.
Re-verified all firewalls OFF
This is really killing me, as I have already opened another question and closed it. Thought it was resolved via updates, but it was the intermittent nature of the problem that fooled me into thinking it was resolved. Old questions is here: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Q_28260322.html