Hi,
I'm having the same issue, my certificate is valid but mIRC sees it as expired.
Summary
Certificate has expired
Issuer
Organization: Let's Encrypt
Host: R3
Country: US
Subject
Host: *.donsid.net
Dns: *.donsid.net, donsid.net
Valid from 01/09/2021 to 30/11/2021
SHA256 fingerprint:
17:30:0A:AF:8B:90:6D:C8:4D:61:B7:98:DB:78:E0:BC:88:C6:55:30:73:C9:A1:1F:5E:D1:67:21:3B:73:E7:BB
Bubble-babble:
xehof-budep-zodan-berys-mufek-cyton-mykul-mumar-sydys-kihuf-besas-namoc-zolut-cinod-covol-fanor-rexox
SHA1 fingerprint:
D3:4C:97:37:05:E5:B9:6E:46:C3:9D:D8:27:53:87:35:B6:BB:5C:FA
Bubble-babble:
xugog-sahuf-luciv-huvyk-vacys-fulit-mynah-fycof-hetir-rylez-pixex
I'm using the same certificate on multiple websites and my browsers see the certificate as valid.
Regards.
