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Bandwith Issues Chrome/Firefox/Edge

We have been using Sophos intercept x advanced with MTR for about 6 weeks. Since then, our bandwidth has dropped 90%. We use a gigabit internet connection and have previously achieved the following values ​​in a speed test in the browser: Down: 900MB/s Up: 800MB/s

Now, if we're lucky, we'll get Down: 60MB/s Up: 300MB/s.

We found out that it is due to the following settings:
 If these settings are deactivated, we have full bandwidth when surfing again. But we don't want to leave them disabled. This is not a condition, the support from Sophos is not getting anywhere either. We expected more...

here are the screenshots from the speedtest:

deactivated settings:

activated settings:

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  • Assuming all features are initially enabled, if you disable in the client UI the option: "Network Threat Protection": 

    ...the SophosIPS.exe and SophosNetFilter.exe processes, which are child processes of the "Sophos Network Threat Protection" service as shown below exit:

    If you disable "Internet" AND "Web Control" at the client with "Network Threat Protection":

    The "SophosNetFilter.exe" process exits but the SophosIPS.exe process continues (assuming IPS is enabled in policy)

    I guess I'm trying to say that disabling "Network Threat Protection", performs the same action as disabling "Internet" and "Web Control".

    I suspect your problem goes away when the SophosNetFilter.exe process exits?

    This can be achieved by either disabling "Web Control" AND "Internet" OR disabling "Network Threat Protection".

    Can you confirm that only disabling "Web Control" and "Internet" is required?

    The next question is, do you have HTTPS inspection enabled? Is https_decrypt_enabled under:


    set to 1 or 0?

    If you disable decryption in policy from Central does the speed return?

  • Hi Sir,

    I can confirm that deactivating Web Control + Internet improves download and upload speed. Https encryption is disabled by default.

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