Login not done by Web Service in 2007

Hi all,
        When  i am trying to connect server through WSDL webservice it gives an error
'Server was unable to process request. ---> Object reference not set to an instance of an object'
I had configured IIS properly in server .
So plz give your valuable suggestions
thanks in advance

Hi,
thanks for ur reply .
I had Configured DCOM properly and also DI server is running in server.
Can i run web service for login in my client machine by reference of server IP ?
plz give ur valuable suggestion.
thanks in advance

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