Secure Print Service Failed to Execute

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I have a web application that calls an ArcGIS 10.2.2 secure print service (accesses secured map services). I am calling the print service using a proxy page. Generally this works, but after roughly 30 minutes the print request fails for no apparent reason, and the ArcGIS Server logs have the following:-

Error executing tool.: Layer "internal": Unable to connect to map server at http://myserver:6080/arcgis/rest/services/Internal/Cadastral/MapServer. Layer "jobs": Unable to connect to map server at http://myserver:6080/arcgis/rest/services/Internal/General/MapServer. Layer "wells": Unable to connect to map server at http://myserver:6080/arcgis/rest/services/Internal/Oil_and_Gas/MapServer. Failed to execute (ExportWebMap). Failed to execute (Export Web Map).The error reported back from the http request is:

Error: Unable to complete operation

The rest of the application works perfectly. If I try printing later (say 20mins), or if I restart the Print Service Tool, it happily prints again for another ~30 mins. It is as if a connection is timing out. Token expiring? Has anyone had this problem before, or can suggest where should direct my attention?



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