Davide Marchi

Hi Massimo, I'm not familiar with Microsoft (Bill gates) Windows. Using Linux (Ubuntu 20.04) all works very fine! bye

For Debian: apt install libnet-dns-perl

Ok, so now, good luck! Upm is a good and rocky software, unfortunately (maybe) little maintained by its developer, but things happen, life goes on.. ;-)

..also checks the integrity of the files (db included)! If you have upload via ftp, they may have suffered damage. Try to upload them via ssh.

..but have you try to excute: chown -R www-data:www-data /upm ? And anyway the problem seems on deletefile.php, check out this ;-)

..without an error log it's like being blind in the darkest night. Have you enabled Apache error log on your vhost? ErrorLog ${APACHE_LOG_DIR}/error.log anyway, I don't see on your log (after the "POST /upm/deletefile.php HTTP/1.1" 200 278 "-" "Jakarta Commons-HttpClient/3.0"): "POST /upm/upload.php HTTP/1.1" 200 do you have it?

I do see libapache2-mod-security2 available in the repo. Do I need to install it? No!

Are you using mod_security (1)? Have you tried (while performing a db upload) to: tail -f /var/log/apache2/error.log and tail -f /var/log/apache2/access.log again are you using mod_security (2)? Verify while performing a db upload: tail -f /var/log/apache2/modsec_audit.log obviously if you use another web server use the specific log files ;-)