Gets the error 'Server Error - The operation has timed out Code: 500' after issuing multiple requests for an attachment in a feature service from REST.
I've reproduced this on more than one machine and this case isn't data or machine specific. It can be easily reproduced.
1) ArcGIS Server/ArcSDE Geodatabase 10 sp5. 2) SQL Server 2008 R2 SP2 3) Feature Service with features that have attachments.
If you keep accessing the attachments from the services directory, after a few requests (about 20 - 30), the attached error shows up. Attachments are accessed using the below URL and clicking on the link to the attachment returned. http://<servername>/ArcGIS/rest/services/attachments/FeatureServer/0/1/attachments/1
To repeat the request, click back on the web browser and click the attachment again.
A temporary fix is to set the fixed number of requests in recycling the application pool in IIS to a small value. The drawback of this fix is that the request after the recycle value will be slow. For eg: if the recycling value is kept at 5, the 6th, 11th, 16, 21st ... requests will take a long time for a response.
This recycle value can be set in IIS > Application Pools > right click on ArcGISServicesAppPool > Click recycling > set the fixed number of requests to a value (I've set 5).
Since this issue seems to be related to how IIS works, I was hoping to get ideas on what could be done to fix this issue for good.
