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When trying to access using Safari (on the latest MacOS), the CSS and JS resources (served from different domains) do not load - failing with a "421" error generated by Apache. See attached screenshot. This has been going on for some time now.

This issue seems to be similar to the one discussed in , and this appears to be a bad interaction between the Apache TLS/vhost handling and Safari trying to be efficient. I don't have direct access to an iPhone/iPad but I can imagine things failing there as well.

The least intrusive solution appears to be to use a separate certificate for each domain, instead of a single certificate with all names as alternatives.

Event Timeline

werner triaged this task as Wishlist priority.Feb 21 2022, 6:42 PM
werner edited projects, added, MacOS; removed Bug Report.
werner added a subscriber: werner.


I just moved Phabricator to a new machine and created separte certificates for and

Please close this bug if this has resolved the issue.

werner claimed this task.

Guessing that it works now.

It does work indeed!

Somehow I did not receive a notification for your comment on November 12 (but I did get one just now)

Anyway, thanks for fixing this.