IE ignores cookies with domain containing underscores

We made a config change recently to a pre-production system.

We made the change because users of the staging environment were getting an SSL certificate warning with a wildcard certificate.

To prevent the warning from appearing we changed


All seemed fine although the pre-production system was barely being used. A week or so later some IE (Internet Explorer) users started reporting problems.

We spent hours trying to get to the bottom of the problem. It turns out that IE ignores/drops cookies for domains with underscores in them.
We had come to this conclusion but we found the solution here.

Simply changing


corrected the issue.


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One Response to “IE ignores cookies with domain containing underscores”

  1. Ben Says:

    Thank you! IE was driving us crazy trying to figure out what was going on.

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