SOAPClient verification

Hello,

I've implemented several SOAP clients using SOAP header authentication 
and standard authentication as parameter values of SOAP functions, 
respectively.
However, I still wonder what the best way is to verify that my client 
got properly instantiated and authentication succeeded.
Using a simple try/catch around the SOAPClient constructor seems  not to 
be enough as no error is thrown even though I use invalid credentials.


Cheers
Frank