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Port remains blocked after DNAT and Firewall changes

Hi All

We have recently taken over IT support for a company that uses a Sophos UTM 9 , We are trying to install our Connectwise Control agent onto the computers. This process can only be triggered from our CW system (no MSI or EXE installer for GP pushout). Anyway the process always fails - I raised the issue with CW support and they said its likely because TCP port 8040 and 8041 was being blocked.

On further testing via canyouseeme.org on the clients server I can indeed see that those ports are not showing as open.

 

I have attempted to create DNAT and Firewall rules as per the info I found on this forum but still struggling. So far I have completed the below:

 

1. I created 2 services one called CW and one called CW2 with each having the below settings

Type or definition: TCP
Destination Port: 8040 (the other service has 8041)
Source Port: 1:65535

 

2. I then created a DNAT rule as a test with the following:

For traffic from: Any
Using Service: CW (CW2 for the 2nd DNAT rule)
Going to: Leased Line (Public IP)

Change the destination to: DC01 (Server)

I also ticked the automatic firewall rule but I also set the below firewall rules as a test

 

Source: Any
Services: CW and CW2
Destination: Any
Action: Allow

Still blocked! 

I am aware that allowing Any is not good practice but when its working I can restrict it down to just the destinations and sources required.


Any ideas?



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  • You probably just need a firewall rule and no NAT. Go to Network Protection -> Firewall an create the rule.

     

    Source: Internal Network

    Service: Both serviceobjects

    Destination: any oder internet ipv4/ipv6

     

    Then you have to save the rule and activate it with the slider.

  • Hi David and welcome to the UTM Community!

    If you still need help after following Thorsten's suggestion, consult #1 in Rulz (last updated 2019-04-17) and show us a relevant line from the log file.

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA