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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 this or similar errors:

On the of SFOS 20.0.1 Firewall:

Those requests generate the following errors in Webfilter

  • reason="HTTP parsing error encountered."
  • user_agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36"
  • status_code="403"

When adding a web exception, it works fine

^([A-Za-z0-9.-]*\.)?chatgpt\.com\/
HTTPS decryption
HTTPS certificate validation

The strange thing is, when the users use ChatGPT without being logged in or use the Microsoft Co-Pilot in edge, it works.

But without the exception, the "HTTP parsing error encountered" is occurring in the webfilter log when they are logged in using their paid Microsoft/ChatGPT account.

Any idea how this problem can be avoided without having the exception?



edited text for logged in users
[bearbeitet von: LHerzog um 1:59 PM (GMT -8) am 6 Nov 2024]
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