A problem that can't reach to machine on network.

PROBLEM: Couldn't reach to machine on network either rdp or ping even safe mode with networking. But the machine was up and no errors at eventviewer. Not resolved by resetting tcp/ip and winsock stack. No problem with nic or server services..

To determine the problem was very hard. I restarted machine without to run some services like IPSEC. Nema problema.. :) The problem was gone..

When I opened IPSEC Monitor with MMC, got error that 0x80070002. The problem occured after starting IPSEC .

CAUSE: corrupted polstore.dll

RESULOTION: regsvr32 polstore.dll

Rebuild a new local policy store. To do this, Click Start, click Run, type regsvr32 polstore.dll in the Open box, and then click OK

Related MS article http://support.microsoft.com/?kbid=912023
To reset TCP/IP http://support.microsoft.com/kb/299357
To reset and repair winsock http://support.microsoft.com/kb/811259