So we saw this in the /15 hive logs recently.
SearchServiceApplicationProxy::Execute--Error occured: System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: Tried IMS endpoints for operation Execute: Operation sent to IMS failed: Resource saturation, try again later.
We would see it when a search crawl was executing while users were trying to search various items. We have three crawl and query servers in the environment, so we didn't think resources could be the cause.
Well....we thought wrong. It turns out two of our three search servers had the IIS Admin Service disabled, which was causing all sorts of havoc with the Security Token Service on the farm.
Starting the IIS Admin Service on the two affected search servers resolved the problem. We were able to pretty easily identify the cause of the issue because the SharePoint Health Analyzer in Central Admin was telling us.
So, uh, don't ignore that red bar in Central Admin. It gave us a really fast fix.
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