Webfilter HTTPS decryption breaks ChatGPT: HTTP parsing error encountered

We're discovering a strange issue with HTTPS decryption and ChatGPT in all browsers we use. ChatGPT is unusable when we're logged in with the ChatGPT-licensed Microsoft Account. Any chat request generates...
TLS decryption issue explanation for beginner

Hello, I am converting our customers from primitive FWs to Sophos XGS's and testing TLS decryption. Would anyone be so kind to walk me through what is happening in specific case below: Setup: TLS...
Sophos XGS v20.0.2 - Heartbeat service dead - Decryption of passphrase is failed

Hello, we performed a firewall migration from an XG450 model to the XGS4500 model last weekend. The firewalls are in a HA configuration. The migration process worked seamlessly. The primary firewall...
Sophos Firewall v21.0 GA - Kyber TLS (Edge/Chrome) connection reset error for transparent TLS decryption

We recently upgraded our Sophos XGS 4300 to SFOS v21. Since then, we are finding that a number of our users were receieving connection reset messages in their browser (Edge and Chrome) when attempting...
v21 Let's Encrypt Cert creation and renewal fails, whan NAT Rule for HTTP/HTTPS exists

On one of our XGS-firewalls, we need a NAT rule for HTTP/HTTPS. On this firewall, it's not possible to create or renewal a Let's Encrypt Cert. We need to disable the NAT rule, then it works to create...