SCCM-The Request Failed with HTTP Status 503: Service Unavailable.

After deploying SCCM 1710, all my SCCM clients did not download any software updates from my distribution point. WSUS was configured using the best practices but no software updates appeared in the software center.

After checking the SCCM logs, the following error appeared:

The request failed with HTTP status 503: Service Unavailable. 

After checking the IIS settings, I noticed that the WsusPool Application Pool in IIS was in a stopped state.

Fix

You just need to start the Application Pool and wait a few minutes until SCCM clients download software updates.

Remember to increase the Private Memory Limit (KB) for the Application Pool. Depending your SCCM server, you must at least increase to 4000000 KB.

 

Thanks for reading! You can follow me on Twitter @PrigentNico

About Nicolas 241 Articles
I work as a System Engineer, based in Switzerland with a primary focus on Microsoft technologies. I have 7 years experience in administering Windows Servers. . I am a Microsoft MVP for Cloud & Datacenter Management. I also received the PowerShell Hero 2016 award by PowerShell.0rg. And finally, I am "MCSE: Cloud Platform and Infrastructure", "MCSA: Windows Servers" and "Administering & Deploying SCCM" certified.