Citrix Xenapp SCOM rules impacting IMASRV.EXE

A Citrix Customer recently reported this major incident which caused them an outage.


IssueUsers were unable to logon to Citrix XenApp 6.55 farm.
Clicking on web interface icon would not do anything, so users might click multiple times.
In the past, the Web Interface was unable to load until we restarted XML service. This time however this was not the case.


Looking on a member server a qfarm /load or qfarm /ltload would take an age (10mins to comeback).

The ZDC showed 20-40%CPU for IMAsrv.exe


To get round the problem we had been playing with Load throttling policies (we have medium now) and also swapping most preferred server.


ResolutionA CDF Trace sent to citrix however resulted on the following conclusion. 

Disabled the following rule in SCOM
"Sample Published Application load from load balancing"

This chance corrected the issue.