As the main thread about this subject was closed for new posts I decided to answer here. I have some new information that may help to track the source of similar “ojs2: 404 Not Found” errors in the log-file.
I added one line to the file /lib/pkp/classes/handler/PKPHandler.inc.php to log the request that caused 404-error.
To do it I found this (almost in the end of the file):
if (!$context) $request->getDispatcher()->handle404();
and added one more line right after it:
if (!$context) error_log("Request caused 404 error: '" . $requestedPath . "'");
it helped to see, that in my case 404-error is connected with request “mappng” - I have no idea WHAT is it (my database doesn’t have such word - I searched and NO files contain such word) - a bit confusing. Maybe you know what this “mappng” is about and where does it come from to make this 404-error appear in the log at every page loading ?