Public bug reported: The fix for (LP: #1082746) implemented a SUBSCRIBE_FORM_SECRET feature. If this is enabled by a site, the subscribe form on the listinfo page contains a hidden input field which includes a hash of various data including the IP address that the GET of the listinfo came from. Upon submission of the form, this hash is recomputed using the IP address that the POST of the form came from, and if the hashes don't match, the subscribe fails. This can cause legitimate subscribes to fail if the user is connected via a load balancer or other device which submits http(s) requests using a possibly different IP for each request. ** Affects: mailman Importance: Medium Assignee: Mark Sapiro (msapiro) Status: In Progress -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/1447445 Title: Web subscribe can fail in cases of load balancers or other devices. To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/1447445/+subscriptions