Assuming you are using the .htaccess Maker feature: please try setting the "Set default expiration time to 1 hour" option to
No and then click on "Save & Create .htaccess".
The root cause of this issue seems to be the same as your ticket
26289. This .htaccess option tells the web server to set the default expiration time by document type, including text/html i.e. the pages created by Joomla. This shouldn't be a problem as Joomla sends cache busting headers where necessary. Unfortunately, Joomla 3.4 and later have a significant bug / oversight in
redirections. Instead of using HTTP 307 for temporary redirections from one page to the next, Joomla is using HTTP 301. Unfortunately HTTP 301 is the HTTP code for a
permanent redirection which is cached by all major browsers (Chrome, Firefox, Opera, Safari, Edge). This causes the browsers to not visit certain pages which are necessary for Joomla! to operate correctly, causing this inexplicable errors. It took me a debugging session several hours long to figure that out last week. The next version of Admin Tools will contain a fix for this issue (we will not set up a default expiration time for text/html documents).
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!
