Vanilla 2.6 is here
! It includes security fixes and requires PHP 7.0. We have therefore ALSO released Vanilla 2.5.2
with security patches if you are still on PHP 5.6 to give you additional time to upgrade.
Please upgrade to 2.3 here.
The 2.2 and earlier branches are no longer being updated.
Vanilla on Nginx behind Nginx proxy
I don't know if this is a problem with Vanilla being behind proxy, I setup Nginx as described in the docs.
But there is problem some URLs emitted by Vanilla lack the hostname part of the url.