Unable to test hosted web services

Hello

Using SOAP Open Source, and having problems testing hosted web services.

I am getting the following error message in SoapUI Log :

An error occurred [premature end of content-length delimited message body (expected: 424; received:421]

I tried to install the web services on my PC, using Wamp, and everything works fine (tests with SOAPUI are positive).

I have spent hours trying to find out  where this could come from, with no success, so if anybody has any idea about this, your help will be welcome !

Thanks

Eric