We are running on Linux 5.10.27-gentoo, PHP 7.4.16, mariadb10.5.9.
I just upgraded to Moodle 3.10.3+ (20210420).
Today, I had over 1000 error messages in the apache log:
[Sun Apr 25 18:58:12.283535 2021] [php7:notice] [pid 5843] [client
188.8.131.52:58781] Default exception handler: error/concurrent access from the same user is not supported Debug: \nError code: concurrent access from the same user is not supported\n$a contents: \n* line 498 of /lib/setuplib.php: moodle_exception thrown\n* line 97 of /lib/editor/atto/autosave-ajax.php: call to print_error()\n, referer:
The forum is a legitimate forum number.
The IP address reported in "client" does not belong to any of our members (it does not occur in *any* Moodle log entry at all).
So...is this some kind of attempt at breaching our Moodle?
There are a significant number of failed login attempts using usernames that do not exist in our user DB, but none with this IP address.