I am now able to connect to the servers without a certificate warning. I did clear the extra entries from servers.ini, ran windows update (just windows defender update) and rebooted my machine, but immediately after this step it still did not work. About an hour later I was able to connect to the servers in question without making any additional changes. After the connections succeeded I reverted to the backups I made of servers.ini and mirc.ini and I could still connect without warning.

Last edited by Loki12583; 30/09/21 02:07 PM.