The root cause is probably that SoapUI sends a request that is larger than the one sent by WCFStrom. Example payloads generated by SoapUI can sometimes be larger than necessary, so you may want to just edit the request content to exclude stuff you don't need.
If it's possible for you change the server configuration, that will probably solve it for you. See this community thread:
http://community.smartbear.com/t5/SoapUI-Open-Source/Request-Entity-Too-Large-Error-Occurs-in-SoapUI/m-p/105069#U105069
... and this Stackoverflow thread:
http://stackoverflow.com/questions/22762311/the-page-was-not-displayed-because-the-request-entity-is-too-large-iis7
Regards,
Manne Fagerlind, Ready! API Developer
