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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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  • Hi!

    Same problem still no solution.
    Core Agent: 2022.4.2.1
    Sophos Intercept X: 2022.1.3.3

    It has nothing to do with "NTP" service.
    1GB duplex lease line reduced to 30Mb/300Mb on client-PC.
    When download large files the "Sophos Net Filter.exe" skyrocketing the CPU usage and the browser (Firefox) becomes very slow.

    Environment: Sophos Central managed Endpoint ( https decryption disabled ).




  • Hi MysteriousDT,

    Checking your account, you don't have the latest updates for Modern Web Offloading yet.

    I suggest doing the following:
    1. Navigate to the following registry location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Sophos Endpoint Defense\EndpointFlags\
    2. Update the registry value from 0 to 1 on "modernweb.offloading.enabled"

    Test your issue once again. If the updated flag set to 1 does have some improvements in the behaviour you're seeing, I suggest opening a support case with our team to ask that your site be moved to an earlier release group to receive the latest update sooner. 

    I see the last opened case you had with us was closed out in December. Further developments have occurred since that time, so inquiring with support again may help you. 

    Kushal Lakhan
    Team Lead, Global Community Support
    Connect with Sophos Support, get alerted, and be informed.
    If a post solves your question, please use the "Verify Answer" button.
    The New Home of Sophos Support Videos!  Visit Sophos Techvids
  • Hi!

    I cannot edit the registry key:
    "error writing the value's new contents"
    Is there any other way to enable this feature (modernweb.offloading.enabled)?

  • Is tamper protection disabled?

    I'd suggest only doing this for testing purposes, as the registry key will revert to the original when policy compliance checks occur.

    Kushal Lakhan
    Team Lead, Global Community Support
    Connect with Sophos Support, get alerted, and be informed.
    If a post solves your question, please use the "Verify Answer" button.
    The New Home of Sophos Support Videos!  Visit Sophos Techvids
  • Hi!

    Today, we tested with "modernweb.offloading.enabled = 1" , it seems this solves the problem.
    It is possible to make this "on" by default on the Endpoint clients?

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