Thread:Project:Support desk/Wiki migration from Debian 7 to Ubuntu 14.04 had strange effect

Hello,

I recently had to move our local wiki (Mediawiki 1.22.8) from Debian 7 to Ubuntu 14.04. I'm using Nginx on both systems and simply moved the database as well as the entire wiki directory to the new server, added the vhost configuration file to nginx and was happy to see everything working. Users can access the wiki via https and they can edit articles just fine BUT:

I then realized accessing the File upload link leads to a 502 Bad Gateway error, then I realized the same is true for the Special pages ( /index.php?title=Spezial:Spezialseiten ) link it also produces a 502 Bad Gateway error

Nginx error log says this in these cases:

2014/08/08 21:19:35 [error] 10406#0: *5 recv failed (104: Connection reset by peer) while reading response header from upstream, client: ........

I'm unsure what might be causing this, since the nginx<->php5-fpm connection is working fine when editing pages and I dont see any errors in php5-fpm.log

Changes from Debian 7 to Ubuntu 14.04 involved: Nginx: 1.2.1 -> 1.4.6 PHP: 5.4.4 -> 5.5.9 MySQL: 5.5.38 -> 5.5.38

Has anybody encountered something similar or has an idea what might be causing this behaviour?

Thanks for any hints