Block unwanted traffic on port 1720

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Block unwanted traffic on port 1720

L0 Member

Hi,

 

I have a voice/visioconference system available on the internet (via NAT-ed IP) using H323. So of course the port 1720 is open and reachable from outside, without restriction on IP addresses because users must be able to reach the system from their smartphone App.

My problem is that sometimes, some traffic on port 1720 (shown as H.225 in the logs) is making the system ringing because a few packets go through the firewall even if it's not legitimate call signaling.

Because the incoming traffic is matching a policy on the firewall my Zone Protection Profile does not block.

How can I better protect this port? Any suggestions?

 

Thank you for helping,

Regards,

Nicolas.

2 REPLIES 2

Cyber Elite
Cyber Elite

Check logs if those "bad" calls come from same country where "good" calls.

Maybe you can block based on source country.

You use application based rules right (not port based)?

Enterprise Architect, Security @ Cloud Carib Ltd
Palo Alto Networks certified from 2011

Hi,

 

Yes I'm using Application-based Rules, and it is recognized as valid h.225 application.

I already limited the source IPs to some Countries, but I still have the same issue.

Because of the mobile Users I can't be to restrictive on souce IP addresses.

I think I will force the mobile users to use SSL VPN to access the Visioconf System and for the other office I can restrict the Access to a few well-known public IP.

 

Regards,

Nicolas.

  • 3088 Views
  • 2 replies
  • 0 Likes
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!