ArcGIS Server SEVERE error "Instance of service '....' failed to process a request."
Our ArcGIS 11.3 Server regularly throws many of the following SEVERE errors (versions 11.2 and 10.9.1 did this as well):
"Instance of service '....' failed to process a request."
This specific error is generate by an APRX which references 7 map services and is used by about a dozen editors to edit the Utility Network through one of the 7 services (the other map services are not editable and do not have a Feature Service enabled).
The errors are thrown from layers in the Table of Contents which have a Data Source Type of "Feature Service Feature Class" which are layers referenced individually (their Layer IDs are in the URL).
Data that is drawn by referencing a full Map Service does not throw this error.
The errors appear to only be thrown on the initial load of the APRX into ArcGIS Pro.
Other actions (pan, zoom, change version, start editing, save edits, etc.) have not been found to throw the error.....
With a dozen editors opening the APRX multiple times throughout a work day, and each time throwing 5 SEVERE errors, this amounts to hundreds of SEVERE errors in the logs each day.
We have noticed that each occurrence of this SEVERE error is also accompanied by a WARNING error:
"Unable to process request. Error handling schema request: java.lang.RuntimeException: java.util.concurrent.ExecutionException: com.esri.arcgis.discovery.servicelib.AGSException: java.io.IOException: Server object extension 'validationserver' not found."
And fewer times, this WARNING:
"Unable to process request. Extension not found."
For reference, here is a screen shot of the errors from ArcGIS Server:
The errors do not appear to have any user impact, and they do not prevent editors from doing their work. At this point, we believe the SEVERE and WARNING errors in the logs are not something we need to be too concerned about, but the issue remains that since there are so many of them, they tend to crowd out what may be other "real" SEVERE errors that need to be handled.
So the question is how do we eliminate these SEVERE errors from the logs? It seems like two solutions may be needed here. One for the map services which are just simple Map Services, and one for the editing service.
Most of the services throwing this error are basic map services. Why would ArcGIS Pro or ArcGIS Server be looking for a Validation Service on a map service that has no editable layers, is not versioned, has no topology or anything else that I am familiar with in relation to the purpose of a Validation Service?
The Utility Network map service is, of course, running over a branch versioned dataset, so do we just turn on a Validation Service? But we can't do that in ArcGIS Server Manager - the checkbox is always greyed out. It appears a Validation Service is applied when the software feels that it is warranted. For example, when we publish a Feature Class with Topology as a Map/Feature Service, it automatically gets a Validation Service applied.
Thanks for any help or ideas, or even questions to help clarify this long and rambling problem description.
