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...
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...
Assistance with Proxy Error Issue

I hope this message finds you well. I am reaching out to request assistance with an issue I am encountering related to a proxy error with the sophos XG 330 (Fw1=SFOS 17.5.12 MR-1). I’ve noticed that when...
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...