cancel
Showing results for 
Search instead for 
Did you mean: 
Highlighted

Allow traffic based on source port

Hi,

I've got McAfee Internet Security running on a Windows 10 PC at the doctor's. She also has a Schiller Heart monitor which transfers results from the test via a network connection to the PC. This did'nt work with the firewall active.

I've done some investigations, and my current conclusions are as follows:

- I cannot allow the application as 'allowed', because it uses a 'javaw' which is installed with the Schiller software, not the 'system-wide' known javaw.exe. The system-wide javaw.exe is already allowed.

- I've taken some Wireshark traces to find out what's going on. As far as I could see:

* Communication is done via SNMP (so UDP)

* The first packet in the dialog comes from the monitor (=remote device), with source port 161. The destination port varies each time and is in the higher order range (5xxxx - 6xxxxx).

* I imagine that the PC announces some random port via multicast/broadcast (not caputed in Wireshark due to filter).

I suppose that I could allows UDP traffic on ports 1-65535, but this needs to be to the entire Internet (-> else my DNS queries do not reach the Internet, they are also sourced with a higher order UDP port number). But why installing a firewall if we allow everything?

I've tried allowing port 161, but this seems only to apply to destination ports...

Any other thoughts to get this working ?

Community Help Hub

    New to the forums or need help finding your way around the forums? There's a whole hub of community resources to help you.

  • Find Forum FAQs
  • Learn How to Earn Badges
  • Ask for Help
Go to Community Help

Join the Community

    Thousands of customers use the McAfee Community for peer-to-peer and expert product support. Enjoy these benefits with a free membership:

  • Get helpful solutions from McAfee experts.
  • Stay connected to product conversations that matter to you.
  • Participate in product groups led by McAfee employees.
Join the Community
Join the Community