‘TLS alert: protocol_version’ after QUIC blocking and connecting via https

[Oliver_222]

‘TLS alert: protocol_version’ after QUIC blocking and connecting via https
Good afternoon

Can you please tell me if HTTPS inspection will work correctly when the connection is already via TCP 443?

We have QUIC blocked. User has Bypass configured in https inspection. In logs we see reject QUIC and then Bypass log with Alert. And we see the error: ‘The probe detected that this destination cannot be inspected and its identity cannot be verified due to a TLS alert (TLS alert: protocol_version)’.
What can this be related to?

[Jan_Kleinhans]

We have the same log entries.

Which firewall version?

[PhoneBoy]

HTTPS Inspection only supports up to TLS 1.2 unless you're on R81+ and USFW is enabled: https://support.checkpoint.com/results/sk/sk167052 
If the remote site requires TLS 1.3 (or above), then I could see this error popping up.

In any case, please provide a full log card (redacting sensitive details.