Redmine

My configuration is very similar to that described in Installing Redmine on Windows Server 2008 R2 and Apache with Thin as a windows service. It worked with Apache 2.2 for long time. Last week I upgraded Apache from 2.2 to 2.4.

Now, I experience some strange behaviour especially with redmine_pastebin plugin. Sometime Redmine shows selected paste, sometimes it shows 404. I tried sequentially 'ctrl-R'. After several tries the paste appears. Next 'ctrl-R' may return 404 or may return the paste again. It's arbitrary.

I tried backend thin server (port 3001) - this strange behaviour did not occur. So, I think that it is something related to proxy/reverse proxy connection between Apache and thin. Also, the Redmine log shows '304' responses, par example:

192.168.20.1 - - [20/Sep/2013:17:07:36 +0300] "GET /issues.xml?offset=0&limit=500&assigned_to_id=3 HTTP/1.1" 304 -

I suspect that some directive should be added in proxy/reverse proxy configuration and would appreciate any hints with this matter.

Ivan