Puzzling. I tried connecting to Libera.Chat with the v7.66 cacert.pem and it worked without any issues.

If you can find a user who is reporting this issue and ask them to install a clean copy of mIRC v7.66 in a new, empty folder in the Windows Documents folder, using the "Portable" option in the installer, and to then run mIRC from there, do they still see the issue?

You could also ask the user to post the date of their cacert.pem using:

//echo $read($mircdir $+ cacert.pem,w,*Certificate data*)

Last edited by Khaled; 30/09/21 08:22 AM.