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Editorial Team
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Asked: 2026-05-11T16:16:31+00:00

I have a site, e.g. example.com , where users can set their own subdomains

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I have a site, e.g. example.com, where users can set their own subdomains (one user – one subdomain) and upload their own scripts, e.g. http://somedomain.example.com/xyzzy.php would map to /www/somedomain/xyzzy.php

Now, on some of those domains, Internet Explorer 7 won’t/can’t accept cookies. Checked with Fiddler: the server sends Set-Cookie response correctly, yet the cookie never shows up in IE – for JS or Developer Tools. On request, IE7 doesn’t send the Cookie header either.

The cookies are set for the user’s domain (e.g. somedomain.example.com), path is /, tried different expiration options (past, future, current, “0”), are not HttpOnly, are not secure.

FF, Opera, Safari and Chrome all work without problems.

Why does IE ignore the cookies?

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1 Answer

  1. Editorial Team

    Does one of the subdomains use an underscore?
    IE has problems accepting cookies from subdomains that don’t follow the URI RFC.

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