SOAP Adapter - HTTP 401

Hi all,

i'm pretty new to SAP-PI and need some help.

We have following asynchronous scenario : XI-Adapter >>>  XI >>> SOAP-Adapter to transfer data from ERP to a 3rd Party-System.

After some changes by the Web-Service-Provider ( certificate & user creditentials) we get a HTTP 401 - Unauthorized Error.

What we did:

1. imported the new certificate
2. set the new creditentials in the communication channel for authentification