I found the answer by myself: insufficient privileges! The worker process had no rights to read the fdo folder. Gunter -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Setup-ASP-NET-application-to-run-with-FDO-tp5196441p5196473.html Sent from the FDO Users mailing list archive at Nabble.com.