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I have Skype for Business Edge server, it has DMZ private IP and translated to Public NAT IP. This IP should open TCP-5061 Port to Internet and we opened. It seems traffic is passing correctly. But in real, when i do telnet test, it's fail.
It's not about destination side. At destination side, TCP-5061 is open and accessible.
People say; So in summary if you are using Checkpoint Firewalls, the default rule of SIP 5061 will do layer 7 inspection of SIP and will not work with Lync/Skype. You need to ensure that you create a standard port of TCP 5061 on your perimeter firewall.
But i'm not sure it might be happen also for Pala Alto
the palo alto networks firewall is application aware, so telnet will not be allowed through unless you add it to a security policy
You don't need to go about creating app overrides etc, you simply need to allow the protocols you wish to use in the security policy
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