Looks like the issue was related to CQ dispatcher bug 'DISP-576 - Dispatcher sometimes returns 404 after flush'. This bug has been fixed in dispatcher version 4.1.12 (Release Date: February 19th, 2016). Dispatcher upgrade has solved the issue.

Thank you for your response.I was able to reproduce this issue with dispatcher 4.1.9. Also, I'v tried different httpd versions and result is the same. I will update my initial post with more details a bit later.

I've faced with the issue, that sometimes Apache Web Server (with dispatcher module 4.1.11) returns '403 Forbidden' response when not cached page is concurrently requested by several threads.I have the following environment:virtual host running in a private cloudOS: CentOS 7.1Web Server: Apache HTTP...