I´m running 12.5.5 on my T15´s and 12.6.2 on my M370´s. All the Comodo certificates is in the firebox trust store, but what missing is these:
USERTrust RSA Certification Authority
Sectigo RSA Extended Validation Secure Server CA
Sectigo RSA Domain Validation Secure Server CA
If you test support.sectigo.com and canadagoose.com from ssllabs, you will see
And this is for proxies - I´m not installing a new signed certificate.
If i go to either canadagoose.com or support.sectigo.com, i will get a certificate warning when using dpi, if i do not install the above certificates.
canadagoose.com, www-roedovrecentrum-dk, support-sectigo-com
Sorry about that -- I was notified that your comments got marked as spam, and I asked they all be released. There might be multiples since it looks like you were posting a few times.
I'll look into the above and ask that they add the certs as needed to the firebox defaults.
WatchGuard Customer Support