[Pkg-mailman-hackers] Bug#996105: web interface stopped working with "django.request Not Found: /mailman//"

[Sébastien Villemot]

Package: mailman3-web
Version: 0+20200530-2
Severity: important

Dear Maintainers,

I’m using mailman3-web on bullseye, and it suddenly stopped working after some
security/point-release update.

The /var/log/mailman3/web/mailman-web.log would contain messages like:

WARNING 2021-10-11 09:29:15,920 46236 django.request Not Found: /mailman//
WARNING 2021-10-11 09:29:15,920 46236 django.request Not Found: /mailman//

Note that this symptom has been discussed on mailman lists:

https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/JSLTGUQDWRGQTOZWUKIOSDJLJSDYMSUC/
https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/USXUYZYB5KIXT37APMCOAUZLKBRPARTL/

It has been suggested there that the latest apache2 security update might be
the cause of the problem.

I applied the workaround suggested on those threads (removing the trailing
slash at line 11 of /etc/mailman3/apache2.conf), and that solved the problem.

Thanks for your work,

--
⢀⣴⠾⠻⢶⣦⠀  Sébastien Villemot
⣾⠁⢠⠒⠀⣿⡁  Debian Developer
⢿⡄⠘⠷⠚⠋⠀  https://sebastien.villemot.name
⠈⠳⣄⠀⠀⠀⠀  https://www.debian.org