PA sending TCP RST for a NAT rule

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PA sending TCP RST for a NAT rule

L1 Bithead

Hi everybody,

Adding a bidirectionnal NAT rule for an ssl web server and the according security rule, connections from outside are dropped as "Incomplete". Traffic capture show that first SYN packet received is directly rejected by PA with a RST response. What does it mean ?



Accepted Solutions


Thank you very much for your advice on NAT rules.

After another check of our configuration, it seems that another host in the same NML subnet not crossing the Palo appliance was using the same IP address ... Everything works as expected now, sorry for the time spent on this obvious problem.



View solution in original post


Cyber Elite
Cyber Elite



As session is incomplete, there is no response/reply from destination end.

Please check few configurations like,


1. Routing for destination server

2. If service is up and running on the server.




Thx for the response.

* There's no routing issue: server can access Internet via the PA using the NAT IP address

* service is up and running, accessible from internal networks



Are you seeing issues with inbound or outbound traffic?




Globally ? Not at all.



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