Network Administrator

We have a domain controller that is a DC, GC and print server. We noticed that the CPU usage is very high. It goes up to 100 % then it drops down to 20% then back to 85%...etc.  The file that is consuming the most CPU is LSASS.exe.

Any help would be appriciated.
rogermendietaAsked:
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Andrej PirmanCommented:
Here is what Microsoft says about it and provides a hotfix:
http://support.microsoft.com/kb/842382

It is also very likely that your AD is corrupted. You may try to restore it from backup, or try some AD repair tools available, like "ntdsutil".
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0791882310Commented:
lsass.exe is a security manager for windows (I.E... windows logons and what not)... so it shouldn't be taking up any resources... unless your running a terminal server.... in other cases lsass.exe is a trojan... make sure where the file in running from... the file location should be [root drive]\[windows root]\system32\...

i would recommend doing some virus scans and what not
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rwetmoreCommented:
You might want to try checking out this blog from MS.  It also has some good tips on troubleshooting LSASS.exe high CPU utilization.

http://blogs.technet.com/askds/archive/2009/04/16/conficker-causes-lsass-to-consume-cpu-time-on-domain-controllers.aspx

Hopefully your client don't have Confiker.
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