I don't know anything about XSP, but I don't think wsHttpBinding is working in Mono. Try with BasicHttpBinding instead... -- View this message in context: http://mono.1490590.n4.nabble.com/Hosting-a-WCF-service-in-XSP2-tp2268394p2268689.html Sent from the Mono - ASP.NET mailing list archive at Nabble.com.