Timeout caused by wait for mutex (code: PE035)

Modified on 2025-06-10 13:53:10 +0200

Every now and then, our Exchange Mailbox sensors generate this error; Timeout caused by wait for mutex (code: PE035).

The errors disappear after rebooting the target server.

PRTG version: 14.1.8.1371+ Target system: Windows SBS 2011 Standard x64 / Exchange 2010 SP1

Any idea on how we can prevent these errors?

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Hi Coen,

you can find the reason and a possible workaround for this issue in the following article:

I have problems with mutex timeouts. What can I do?

Since the Exchange Mailbox (Powershell) sensor uses an exe for monitoring, this article also applies to this sensor type.

Mar, 2014 - Permalink

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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.

Timeout caused by wait for mutex (code: PE035)

Article CommentsAttention: This article is a record of a conversation with the Paessler support team. The information in this conversation is not updated to preserve the historical record. As a result, some of the information or recommendations in this conversation might be out of date.

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Attention: This article is a record of a conversation with the Paessler support team. The information in this conversation is not updated to preserve the historical record. As a result, some of the information or recommendations in this conversation might be out of date.