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Discussions Firefox (especially Gmail) cannot complete some requests: no responses are returned (zero bytes), assume that because of Endpoint Agent

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Firefox (especially Gmail) cannot complete some requests: no responses are returned (zero bytes), assume that because of Endpoint Agent

Sophos User6083 over 2 years ago

It is almost impossible to use Gmail (mail.google.com) in Firefox. There are no problems in Chrome on the same machine.

In the browser developer console / Network tab I see some requests are without responses (zero bytes responses). Some with SSL_ERROR_BAD_MAC_ALERT

GMail app constantly shows yellow warning: "Ups... the system encountered a problem. Retrying in ..." . "Retry now" link doesn't help.

Similar errors discussed recently: https://community.sophos.com/sophos-central/f/discussions/133650/ssl_error_bad_mac_alert-pr_end_of_file_error

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Sophos User930 over 2 years ago in reply to Sophos User6083 +2

Is this Windows? I assume this behaviour has to be related to web protection and control, is that the case? If it's Windows, do you have a process called SophosNetFilter.exe? If so, you are using …

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0 Wayne Folta over 2 years ago

I believe Firefox has its own way of determining CA certificate trust, and also of DNS. This particular problem might be Intercept X only, but Intercept X can also do TLS decryption, so it could be XG or Intercept X and it could be Firefox and not a general problem:

https://docs.sophos.com/central/Customer/help/en-us/ManageYourProducts/Overview/GlobalSettings/DecryptHTTPS/index.html
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0 Wayne Folta over 2 years ago

I believe Firefox has its own way of determining CA certificate trust, and also of DNS. This particular problem might be Intercept X only, but Intercept X can also do TLS decryption, so it could be XG or Intercept X and it could be Firefox and not a general problem:

https://docs.sophos.com/central/Customer/help/en-us/ManageYourProducts/Overview/GlobalSettings/DecryptHTTPS/index.html
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