SOAPpy and http authentication

[Odd-R.]

I use the following piece of code to contact a webservice,
and read a wsdl file.

from SOAPpy import WSDL
from SOAPpy import URLopener
url= ' http://someserver/somewebservice
url1 = URLopener.URLopener(username='user',passwd='pass')
server=WSDL.Proxy(url1.open(url))

This yields no errors, and everyting is fine.

However, when I start calling the actual methods of
this webservice, I get this error

SOAPpy.Errors.HTTPError: <HTTPError 401 Unauthorized>

How can I avoid this?

Thanks in advance for all help!

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