I assume you meant "now try disable mod_gtranslate" so I disabled it and rebooted the server (just to be sure I restarted all necessary processes). I got the same error in the web interface, and in the logs. Here are the relevant log entries:
[Fri May 06 07:36:45.937479 2016] [fastcgi:error] [pid 7262] [client 192.168.250.3:59683] FastCGI: comm with server "/usr/lib/cgi-bin/php5-fcgi" aborted: idle timeout (30 sec), referer: https://(host)/forum/newtopic.html
[Fri May 06 07:36:45.937567 2016] [fastcgi:error] [pid 7262] [client 192.168.250.3:59683] FastCGI: incomplete headers (0 bytes) received from server "/usr/lib/cgi-bin/php5-fcgi", referer: https:/(host)/forum/newtopic.html
Though both gtranslate and mod_light_rss were throwing errors of their own before I disabled them, they don't seem to be interacting with kunena, as the errors surrounding the creation of a new post, or replying to an existing one are still present in their same form regardless of whether those mods are enabled. This is actually good news, as we need gtranslate, and would like to offer rss feeds.
It's interesting that the errors we see occur 30 seconds or so *after* I press submit, but the posts are making it up to the forum.
As a further test of this, I submitted a reply to the previous post in one tab, and looked for it to show up in another tab. It showed up as quickly as I was able to switch tabs, and refresh the window. So, clearly the problem occurs when kunena is trying to retrieve the status *after* the post.
I'm not sure what it's doing in this phase - but this is where the problem occurs.
