In protocol/http/org/apache/jmeter/protocol/http/sampler/SoapSampler.java the HTTP Content-Length parameter is Content-length, and some strict firewalls (etc Zorp) do not let through Soap requests.
Created attachment 12815 [details] This is the resolution of the problem
Added to CVS rel 2.0; also changed Content-type to Content-Type just in case
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/1450