Windows Authentication for asp.net with IIS out domain

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IIS5.1

ASP.NET

IIS

Hi Friends

I am stuck up in the very difficult situation and need help from codeproject expertise.

My scenario is as below

I am working for a Bank's Audit department and developing web solution for them. Since bank policy is to use Window authentication for login , I had developed the code to retrieve the windows login id and then matching it with Active directory to authenticate .

it was working in my development server but when I deployed the same code in Production I realize that the server is outside the domain and hence when ever I login from domain it prompts for user name and password , and finally goes to access denied for any domain user Error code 401.1 .

Is there any workaround to make the web application work with windows authentication

Thanks