I am experiencing a really strange problem in my network which consists of a Small Business Server 2011 + 25 PC's running Windows 7 Pro.
Some of my users starts to complain that their pc was taking extremely long to start.
Others that they could access Outlook but not the shared network drives.
While this is going on other users did not experience any problems.
I tried to rejoin these computers to the domain which was not possible because they could not locate the domain controller. If I configure these pc's with static ip addresses the problem was solved instantly!
I have examined DHCP server on my SBS without seing any issues.
Never the less I have a handfull random computers which are not able to optain DHCP address.
I have not changed any switches or routers.
This problem has been building up in a long time, but seems to get worse!
Have you run : "Fix my network" wizard in Console>Networking?
Have you disables IPV6 ? If so re-enable
Are all problem machines connected to same switch.
If all above is irrelevant:
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