Configure IIS authentication from another domain

Question

I have the following scenario: I have Web Application hosted on IIS and I am in domain a.b.com. The IIS is configured to authenticate the users with windows authentication and everyone that in the domain a.b.com can enter the site. But there are users that in another domain lets call it c.d.com and they can't enter the site with their windows credentials because the IIS check against a.b.com...

How can I configure IIS to check for windows user in c.d.com?

Solution

Try below process.

1. Go to (IIS) Manager.
2. Right Click on Web-Application.
3. Select Edit Permission option.
4. Select Security tab.
5. Click on Edit... button.
6. Click on Add... button.
7. Write your new user domain name
8. Click OK
9. select newly added User name from Group or user names:
10. tick on Allow
11. Click OK

-It should work