I'm sorry Rio, I'm at work now and I can't look JBossWS sources now. All I can do now is look at client log4j logs. If I enable WS-Security I can see this where I can find two times ...HEADER={SOAPAction="", Content-Type=text/xml... | ... | DEBUG main org.jboss.remoting.MicroRemoteClientInvoker - org.jboss.remoting.transport.http.HTTPClientInvoker@1922f46 connecting | DEBUG main org.jboss.remoting.MicroRemoteClientInvoker - org.jboss.remoting.transport.http.HTTPClientInvoker@1922f46 connected | DEBUG main org.jboss.ws.core.client.RemotingConnectionImpl - Remoting metadata: {http.basic.password=mypassword, http.basic.username=myusername, HEADER={SOAPAction="", Content-Type=text/xml; charset=UTF-8}, NoThrowOnError=true} | DEBUG main org.jboss.remoting.transport.http.HTTPClientInvoker - Setting request header with SOAPAction : "" | DEBUG main org.jboss.remoting.transport.http.HTTPClientInvoker - Setting request header with Content-Type : text/xml; charset=UTF-8 | DEBUG main org.jboss.ws.core.soap.SOAPContentElement - MTOM enabled: Restore XOP data | DEBUG main org.jboss.ws.extensions.xop.XOPContext - Replace base64 representation on element [xmlName=inputMessage] | DEBUG main org.jboss.ws.extensions.xop.jaxrpc.XOPMarshallerImpl - serialize: [xmlName=attachment] | DEBUG main org.jboss.ws.core.soap.attachment.CIDGenerator - generateFromName: attachment-37b4f42c-7f38-43b1-b905-9e5d3a3b08c8(a)ws.jboss.org | DEBUG main org.jboss.ws.extensions.xop.jaxrpc.XOPMarshallerImpl - Created attachment part attachment-37b4f42c-7f38-43b1-b905-9e5d3a3b08c8(a)ws.jboss.org, with content-type application/octet-stream | DEBUG main org.jboss.ws.extensions.xop.XOPContext - Restored xop:Include element on [xmlName=attachment] | DEBUG main org.jboss.ws.core.soap.SOAPMessageUnMarshaller - getMimeHeaders from: {X-Powered-By=[Servlet 2.4; JBoss-4.2.0.GA (build: SVNTag=JBoss_4_2_0_GA date=200705111440)/Tomcat-5.5], ResponseCodeMessage=OK, http.basic.password=mypassword, Date=[Tue, 26 Jun 2007 13:23:19 GMT], http.basic.username=myusername, Content-Type=[text/xml;charset=UTF-8], Server=[Apache-Coyote/1.1], HEADER={SOAPAction="", Content-Type=text/xml; charset=UTF-8}, Transfer-Encoding=[chunked], NoThrowOnError=true, ResponseCode=200} | DEBUG main org.jboss.ws.core.soap.MessageFactoryImpl - createMessage: [contentType=text/xml; charset=UTF-8] | Instead If I disable WS-Security the Content-Type is correct (and type too) | ... | DEBUG main org.jboss.remoting.MicroRemoteClientInvoker - org.jboss.remoting.transport.http.HTTPClientInvoker@82751 connected | DEBUG main org.jboss.ws.core.client.RemotingConnectionImpl - Remoting metadata: {http.basic.password=mypassword, http.basic.username=myusername, HEADER={SOAPAction="", Content-Type=multipart/related; type="application/xop+xml"; start="<rootpart(a)ws.jboss.org>"; | | start-info="text/xml"; | | boundary="----=_Part_0_7896086.1182865340817"}, NoThrowOnError=true} | DEBUG main org.jboss.remoting.transport.http.HTTPClientInvoker - Setting request header with SOAPAction : "" | DEBUG main org.jboss.remoting.transport.http.HTTPClientInvoker - Setting request header with Content-Type : multipart/related; type="application/xop+xml"; start="<rootpart(a)ws.jboss.org>"; | | start-info="text/xml"; | | boundary="----=_Part_0_7896086.1182865340817" | DEBUG main org.jboss.ws.core.soap.SOAPMessageUnMarshaller - getMimeHeaders from: {Connection=[close], X-Powered-By=[Servlet 2.4; JBoss-4.2.0.GA (build: SVNTag=JBoss_4_2_0_GA date=200705111440)/Tomcat-5.5], ResponseCodeMessage=Internal Server Error, http.basic.password=mypassword, Date=[Tue, 26 Jun 2007 13:42:21 GMT], http.basic.username=myusername, Content-Type=[text/xml;charset=UTF-8], Server=[Apache-Coyote/1.1], HEADER={SOAPAction="", Content-Type=multipart/related; type="application/xop+xml"; start="<rootpart(a)ws.jboss.org>"; | | start-info="text/xml"; | | boundary="----=_Part_0_7896086.1182865340817"}, Transfer-Encoding=[chunked], NoThrowOnError=true, ResponseCode=500} | DEBUG main org.jboss.ws.core.soap.MessageFactoryImpl - createMessage: [contentType=text/xml; charset=UTF-8] | ... | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4057717#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...