Starting approximately a week ago, teachers began reporting the following error when trying to make small text changes on pages:
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request POST /course/modedit.php.
Reason: Error reading from remote server
Since then we have confirmed the firewall logs are not showing anything being restricted, there have been no network or server changes. We have also tried changing the following
- Search for the post_max_size setting to 200M
- Do the same for upload_max_filesize (make the numbers the same)
- Search for the max_execution_time setting and up this to 300
Any recommendations as to a possible cause and/or additional items to test?