Press "Enter" to skip to content

Sophos XG high traffic on the BITS application



The Windows and Office 2016 updates use the operating system BITS to download the updates.

The passage in the proxy of the firewall and the antivirus scan “prevents” the download and it runs in a loop saturating the tape..

You can see on the screenshot below the statistics on 12 hours with almost 80GB of download.
Statistiques internet

How you can see them also on the following screenshots made with PRTG on the monitoring of firewall interfaces, only the Wan interface (left) is impacted, the Lan interface (right) of the firewall records normal traffic. All download data do not go to the post on your network.
Port WAN port lan


To solve this problem, you must add a proxy control exception to do a bypass on the antivirus scan

1. From the interface of your firewall, go to Web 1 > Exceptions 2 and click on the pencil 3 to edit the exception Microsoft Windows Update.
Sophos XG Web > Exceptions

2. Edit the exception by adding the following domains 1 and click on Save 2.
sophos xg exception windows update

3. Enable the exception by moving the cursor to ON 1 if this is not already the case.
Activer exception

4. Wait a little while the rule applies and the data is sent to the post. How you can see on the catch below the traffic is back to normal 1.
Trafic de retour à la normale

For further

I take this article also to introduce another exception, which is that of url url Microsoft also uses this service to offer updates.

1. From the exceptions page, click on the button .

2. Give a name 1, check the box URL template matches 2, enter the regex 3 below, check the boxes 4 to ignore the checks and click on Save 5.
Ajout exception

3. Your exception has been added 1, move the cursor to ON 2 to activate it.
Sophos XG exception ajoutée

Related Post

Sophos XG: Configure the SNMP Agent If you want to supervise the firewall using the SNMP service with software (PRTG, Centreon ...), you must activate and configure the agent on the fire...
Sophos XG: change the SSL VPN port By default the SSL VPN port on the Sophos XG firewall is 8443, since version 17.1 it is possible to change the VPN listening port. %start_p_warning...
Sophos XG: add a host On the Sophos XG firewall, it is necessary in certain cases to declare the host so that it can be used in the firewall rules. 1. From the interface...
Sophos XG: Web and application filtering In this tutorial, we'll see how to put filtering on outgoing streams with a Sophos XG firewall. I will show you the two filter modules: Web: w...

Leave a Reply

Your email address will not be published. Required fields are marked *