Hello everyone. I had a problem on Windows 2003 server standard edition SP2. It worked very slow. But this procedure helped http://blogs.msdn.com/distributedservices/archive/2009/01/21/dcom-error-10010-in-the-event-logs-and-sluggish-server-performance.aspx I need your help to understand why it could happen? Maybe someone met this issue before? This server is proxy server using ISA.

Hi , It is very difficult to predict what component caused the problem. One way to identify the root cause of the problem is to collect the dumps during the problem and analyze them to find out which component was causing the issue. One way to identify is to understand if the problem exhibits on core system components or with 3rd party applications and then proceed accordingly. The arcticle mentions the problem with windows 2003 sp1 and xp sp2 , and also the Root cause was not known.It is very hard to predict what caused the users group to be removed from the CLSID. So next time you encounter the similar problem, you need to make sure a) if the problem is occuring with each and every OS component b) or if the problem lies with 3rd party application c) collect the relevant dump using adplus and analyze them. http://windowsarchitecture.spaces.live.com/blog/cns!C8EE0FE9E055C129!222.entry or http://support.microsoft.com/kb/286350

Thank you very much for your answer. I will try all those steps.