Very slow WLAN using SD-RED20 + wifi module (802.11 AC 2x2 wifi module (for 125w / 135w rev3)


I'm having problem using new RED20 device + WiFi module.

With ethernet speed is just fine, but when connected to wifi connection speed is horrible.

RED's operation mode is Standard/unified.

Tested with various devices. Laptop connects to REDs AP at 300Mbps.

Most of the time Ping is well over 100. At worst over 3000ms.

What could be done to fix this? Firewall we're using is XG 210 running SFOS 17.5.11 MR-11.

Patterns are up to date.


Here's some pics:  


This is the speed with laptop connected to RED's wifi: 


This is the result when connected with ethernet through RED:

This is the Wifi speed when same device connected to APX320 to clarify it's not the client device issue (Not connected to RED):

  • Hi Jarno Hynynen,

    Please run command : iwlist scan from wireless client and provide the result if possible.

    Also provide name of SSID you have configured on RED.



  • In reply to Kaushal Kansara:

    Just got the new device from Sophos.

    Guess what...

    It does NOT work either. It's just the same.

  • In reply to Jarno Hynynen:

    From my sources I just had a message:

    "This problem has raised multiple tickets so far. And R&D is trying to fix it with severity level "Very High" 



    So please Sophos "official" support, could you please comment this. Where are we now with this?

    What is the estimate when we can expect to have this fix?

  • In reply to Jarno Hynynen:

    We are actively investigating unusually slow wireless performance on a small number of SD-RED devices. The problem has been reproduced and Engineering are currently trying to root cause the issue. The tracking ID for this issue is NRF-341.

    This is indeed getting very high priority and I hope to have an answer very soon, but clearly I cannot make a commitment to a possible fix time. I will keep the Community updated when I know more


    Stuart Hatto | XG Product Management