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Editorial Team
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Asked: 2026-05-27T01:05:01+00:00

I have a website created with ASP.NET and a web service, both using FormsAuthentication

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I have a website created with ASP.NET and a web service, both using FormsAuthentication (which validates the user’s credentials against Active Directory – LDAP).

When I call an action method of this web service for the first time I am redirected to the site’s web page that actually logs the users into the system. When I’m logged in I will be redirected to the web service (ReturnUrl), but I’m guessing something gets lost in the way, because I’m getting an InvalidOperationException (in the client), containing the .asmx definition.

This happens on the first call only, the next calls work fine (since I’m going to the right place).

What am I missing here?

How should I redirect from the web site to the web service? Can this be done?

Thanks in advance.

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1 Answer

  1. Editorial Team

    Your web service call is doing a Post, then redirecting via a Get request after authentication. The default response from an ASMX is the .wsdl definition. You can’t do web service authentication like this programmatically.

    If you are using Active Directory, why not use Windows Authentication and suppress the login?

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