Problem: when trying to access exchange control panel, after entering credentials server returns error 500. If you look to event viewer you find the errors like this:
System.InvalidOperationException: Cannot load Counter Name data because an invalid index 'W3SVC_W3WP' was read from the registry.
Login to OWA is working normally.
Solution: On server run command prompt with administrative privilegies and run command:
lodctr /R
If you get an error, try to run again. After it finished with success, restart IIS with command
iisrestart
After that try to login to ECP.
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