Well, solved my own problem; had to use: domain = mono_jit_init_version ("MyDomain","v4.0.20506"); instead of the vanilla mono_jit_init -- View this message in context: http://mono.1490590.n4.nabble.com/System-TypeLoadException-BasicHttpBinding-tp4406927p4406996.html Sent from the Mono - General mailing list archive at Nabble.com.