I wanted to start the profile synchronization job on my Sharepoint 2010 instance. One of the problems it did not work was, that the Security Token Service was not running.
I checked the health analyzer reports and there was the Security Token Service marked as not available. Then I went to IIS and there picked the SharePoint Web Services Site and in the tree below clicked SecurityTokenServiceApplication and checked the basic settings. when clicking "Test settings" I received an error, that the application path was not correct. Clicked the "Connect as" button and inserted a user, where I knew it has extended rights and voila the tested connection worked.
This was still not solving the issue with the profile synchronization, but at least one step closer.
