How We Solved WMI Error "8002801D : Library Not Registered" On An Exchange 2003 Server

Originally published on April 27, 2009 by Dirk Paessler
Last updated on January 23, 2024 • 2 minute read

When we tried to monitor a test installation of Exchange Server 2003 in our labs using WMI we always received the following WMI error message: 
8002801D : Library not registered.
Using the following procedure we were able to reenable WMI monitoring for the Exchange Server:

Restarting WMI Services

The monitoring data for Exchange Server 2003 is supplied via WMI (Windows Management Instumentation). Apparently it simply helped to restart the WMI Service (using winmgmt.exe). Open a cmd console and issue the following commands: 
  winmgmt /clearadap
  winmgmt /kill
  winmgmt /unregserver
  winmgmt /regserver
  winmgmt /resyncperf
Close the console and restart the PRTG7 Probe Service. Your sensors should now turn green and display values. This procedure might also help solving WMI problems with other systems as well, we are still investigating this. Note: Some users reported that they had to go through this procedure several times.

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