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Application Insights and Sharepoint: not a good combination

After installing the Application Insights Monitoring Agent on one of our Application Servers, users started to complain that the Sharepoint environment running on the same machine became very slow.

When looking inside the Event Log on the server, we found a lot of errors similar to the following:

Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2

Faulting module name: ntdll.dll, version: 6.1.7601.18247, time stamp: 0x521eaf24

Exception code: 0xc0000374

Fault offset: 0x00000000000c4102

Faulting process id: 0x10e8

Faulting application start time: 0x01cf4838c2e39a9a

Faulting application path: c:\windows\system32\inetsrv\w3wp.exe

Faulting module path: C:\Windows\SYSTEM32\ntdll.dll

Report Id: 5fce3de2-b42c-11e3-9d78-005056924d03

The MSDN forums and the Connect site brought some answers to this issue and linked the issue to our recently installed Monitoring Agent. And indeed after removing the Monitoring Agent, the issue was gone…

In the meanwhile a new version of Application Insights agent got released that will hopefully contain a fix(I still have to test it myself).

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