ruzam/joomla-platform — comment on commit 4ebfac72c195202f0c7043df4e6de04d9b6b8144
File:  line 0
By ruzam:

Ya, still figuring out this git commit thing. This commit should be included with https://github.com/joomla/joomla-platform/pull/735

Administrator tools don't use $live_site at all ($sef or not). This makes the form action url relative. Relative form urls will post to the host name site name unless otherwise specified. So if the host is behind a proxy, the form request goes to the wrong address.