Authentification failed

Hi all!

I create my web service and I chose HTTP authentification mechanism. After that in Visual Administrator for my portal I configurated Web Service Security in URL I put string connection like in logical port for example:

http://epaw008:50000/GetSAPClient/Config1?style=document

in Logon data I selected Authentification - BASIC and put user name and pass. But when I try test my web services authentification failed and no any message shows me. Why??