Globalprotect traffic translated to port 20077

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Globalprotect traffic translated to port 20077

L1 Bithead

Hi Team, in our test env I have a firewall with GP config. I would like to NAT the GP traffic to a loopback interface. Original destination port is 50443 and a NAT rule is set up to translate it to 443 (and the dest address as well...)

However, if I send a connection request from client it reports that the portal is unavailable. From the firewall logs it is visible the NAT in regards of the ip addresses are working well (so the trafic hits the proper rule) but somehow the destination port is turned to 20077 instead of 443, so there is no any response for the request of course. What could be the reason behind it?

 

mkukucska_0-1716826769652.pngmkukucska_1-1716826853298.png

 

mkukucska_2-1716826899211.png

 

Thank you in advance for any hint!

3 REPLIES 3

Community Team Member

Hi @mkukucska ,

 

It looks like the traffic isn't hitting your DNAT rule. I see the details of the traffic log and I see source zone WAN, but a destination zone of VPN. 

LIVEcommunity team member
Stay Secure,
Jay
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Hi Jay,

 

As you can see the test policy match screenshot, traffic is matching the proper rule. Additionally, the destination ip address is turned to the proper one.

VPN zone is visible in the security log details, because in the case of incoming traffic the security policy, if NAT is in place, must be configured with pre-nat ip address but with post-nat zone.

Any other hint related to the issue?

 

Kind regards,

Mihaly

L0 Member

I have the same issue since a few days. And i didnt made any changes to the firewall. I also tried to create a no-nat Rule at the Top of the nat Policies without any effect. I also configured the gatway and portal from the loopback interface back on the external puplic ip directly and there is still a nat to  port 20077. saved a config file and looked at all nat rules. There is not nat rule that include port 20077.

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