Error: 500.19 Internal Server

Error appears when trying to launch the web service.

To correct this follow the steps below:

Open IIS Manager, select root node( the hosting server), in the middle panel double click Feature Delegation. In right panel select Custom Site Delegation..., In upper part of middle panel, click the drop down list and select your site. In Action panel click Reset All Delegation.

There are screen shots associated with the fix at this website:

http://www.winservermart.com/HowTo/HTTP_Error_500_19_IIS_7.aspx