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Home/ Questions/Q 3984712
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Editorial Team
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Editorial Team
Asked: May 20, 20262026-05-20T05:48:11+00:00 2026-05-20T05:48:11+00:00

Forms authentication doesnt work when a fully qualified domain name is used localhost works

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Forms authentication doesnt work when a fully qualified domain name is used

localhost works
computername works
computername.fullyqualify.com does not work.
IP address works.

It ends up going in a loop between redirecting between the login and the main page.

It is almost as though the cookie is not being written.

Is there an IIS or active directory setting that I need to change here?

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  1. Editorial Team
    Editorial Team
    2026-05-20T05:48:12+00:00Added an answer on May 20, 2026 at 5:48 am

    It is DNS’ job to resolve FQDNs to IPs. From IIS you specify what IP to use, from a pool of IPs assigned to your Web Server, with which site amongt many hosted on your Web Server.

    Check if you have correct Canonical Name record (CNAME) entries in you AD for the desired IPs.

    Also ensure that it’s replicated to all DNS servers if you have load balancing in AD.

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