PrintingTools (GP server) Export Web Map Task -> execute fails - 404 error

Discussion created by SRoberts on Dec 21, 2012
Latest reply on Apr 8, 2014 by abrown31
I have an ArcGIS server 10.1 installation with the GIS server behind the firewall, and the Web adaptor installed on a public web server.  I am trying to test our server's Utilities->PrintingTools (GPServer)->Export Web Map Task->execute function using the REST services directory.  I have all the parameters correct and can Exectute (POST) from inside our network.  When I try to execute it from outside our firewall I am able to get to the execute page, but when I hit the Execute (POST) button, I get a 404 page not found error.  The utilities folder and the Printing Tools service are unsecured on our server.  I am able to access our other published unsecured map services and am able to carry out a function such as Query (POST) on that map service from outside our network. 

Does anyone have an idea of why this might be happening, or suggestions for troubleshooting methods? 
Thanks in Advance,
S. Roberts

The url for our print service is http://webServer/arcgis/rest/services/Utilities/PrintingTools/GPServer/Export%20Web%20Map%20Task/execute/          where webServer should be replaced with

I am using these parameters
Format: PDF
Layout Template: A4 Landscape
Web Map as JSON string:
{"mapOptions":{"extent":{"xmin":-13469468.571186269,"ymin":4768589.386064244,"xmax":-13440441.609695012,"ymax":4781488.134587351,"spatialReference":{"wkid":102100}},"spatialReference":{"wkid":102100}},"baseMap":{"title":"Shared Imagery Basemap","baseMapLayers":[{"url":""}]},"exportOptions":{"dpi":300,"outputSize":[500,500]},"layoutOptions":{"titleText":"TestMap","scaleBarOptions":{"metricUnit":"kilometers","metricLabel":"km","nonMetricUnit":"miles","nonMetricLabel":"mi"}}}