i run a sample with java client and apache-tomcat using ssl and authentification : it works fine. I try to run this sample with vb client : it doesn't work ! 1 i create a client certificate (.cer export in the client registry through IE) and a server certificate. i export both in the server keystore. 2. i set the connector properties like this on the client : Connector.Property("UseSSL") = True Connector.Property("SSLClientCertificateName") = [mycertif] 3. in server.xml (tomcat) i declare : <Connector className ="org.apache.tomcat.service.PoolTcpConnector"> <Parameter name="handler" value ="org.apache.tomcat.service.http.HttpConnectionHandler"/> <Parameter name="port" value="443"/> <Parameter name="socketFactory" value="org.apache.tomcat.net.SSLSocketFactory" /> <Parameter name="keystore" value="c:\keystore\server.keystore" /> <Parameter name="keypass" value="changeit"/> <Parameter name="clientAuth" value="true"/> </Connector> what's wrong ? thanks jerome