There are 2 operational logs for the App Catalog server side.
- <Drive Letter>\SMS_CCM\CMApplicationCatalog\Logs\ServicePortalWebSite.log
- <Drive Letter>\SMS_CCM\CMApplicationCatalogSvc\Logs\ServicePortalWebService.log
Troubleshooting
If the App catalog has an error message “Cannot Connect to the Application Server” this is referring the to the ServicePortalWebService.log.
So far I have only seen the error:
error: WriteHeadersCallback(WebExceptionStatus errorStatus, ConnectStream stream, Boolean async)
in the log ServicePortalWebSite.log
restarting the IIS service resolved this.