http://developers.de/blogs/damir_dobric/archive/2007/09/03/default-quoting-in-wcf.aspxBy transferring of messages sometimes one message can contain the data which exceeds some limits, which are internally defined by WCF. In such cases you will possible get some error messages which look like following one: Test method xxxxx threw exceptionenCommunityServer 2008 SP1 (Build: 30619.63)