What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

WMI Errors



I have two servers that on a weekly basis will give me this error

Last Message: WMI request timed out. Probe's WMI system had to be stopped. Please pause or delete sensor and restart probe! (code: PE051)

There is no problems with the server that I can see and I have restarted both the PRTG server and the affected servers and this still occurs at random times about once a week. I have found no pattern that would match it to workload or backup.

What is the cause and solution to the problem? I am monitoring over 30 Windows servers and just two of them give me this alert.

Needless to say, by supervisor is concerned, but is also tired of being interrupted on the weekends because of a false positive alarm.

pe051 probe wmi

Created on Oct 5, 2011 4:58:51 PM

1 Reply




have you tried repairing the WMI System on these two particular hosts? Sometimes WMI responses with total non-sensical results to breaks the connection in a very critical way for the PRTG Probe. You could consider or try installing a remote probe on these hosts, or maybe using SNMP to monitor these two.

best regards.

Created on Oct 6, 2011 2:44:41 PM by  Torsten Lindner [Paessler Support]

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.