I upgraded a server from 4.1.10 to 4.1.12 today and it completely broke php and the web console. All php scripts result in 503, as does accessing the web console. there are numerous unhelpful errors in stderr.log: and some more in my admin error log: Reverting to 4.1.10 solved all problems instantly. Additionally, since upgrading I've noticed a new file: /tmp/secret/lscgid.sock I can't find any references to this file in any of the config files, so I'm unsure of the purpose. Other servers that still run 4.1.10 don't have this file. I tried deleting it, but that results in: Reverting back to 4.1.10 did not remove the need for this file for some reason.