[Mailman-Users] Somebody could not subscribe to pypy-dev at python.org

[Laura Creighton]

In a message of Wed, 22 Apr 2015 16:52:33 -0700, Mark Sapiro writes:
>It wouldn't be his machine. It would be something between his machine
>and mail.python.org. Perhaps some kind of load balancer or other
>device which submits each separate http request from one of a pool of
>IP addresses. Thus, the subscribe only works if whatever it is uses
>the same IP for both the GET and POST and the presence/absence of a
>password is just a coincidence.

BINGO.  He has found out that this is what happens at his (new) work
site.  It's a load balancer.  He is very grateful for getting this
figured out. :) I fear that this sort of load balancing is going to
become all the more common in the future.  Is insisting that the IP
addresses match serving a useful purpose?  Should we have a more
informative error message?

Laura