Unexpected behaviour in security policy
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07-27-2020 11:18 AM
I have one server belongs from the DMZ zone.
Example:-
server ip- 2.2.2.2
source ip for VPN user - 1.1.1.1
VPN zone
DMZ zone
There is 2 scenerio:-
policy(1) - I have created a policy like:-
sourcezone- VPNzone
source ip - 1.1.1.1
destination zone - DMZ zone
destination IP - Create an address object for 2.2.2.2.
Application - ANY
services - ANY
Action - Allow
no security profile.
Policy(2):-
sourcezone- VPNzone
source ip - 1.1.1.1
destination zone - DMZ zone
destination IP - 2.2.2.2
Application - ANY
services - ANY
Action - Allow
no security profile.
I can access 2.2.2.2 by policy(1) but when i apply policy(2) it is not accessible why this strange behaviour i am not able to find out.
once i applied policy -2 the traffic has been dropped.
PAN-OS version - 9.0.9-h1
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07-27-2020 02:29 PM
Hello,
I would say make sure you have logging enabled on the policy and check the logs to see why the PAN is denying the traffic.
Regards,
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07-28-2020 03:00 AM
Yes , i have checked the same , once i applied policy-1 it will bypass all the policy and heat directly to deny any-any.
And i can see the traffic is dropped.
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07-28-2020 07:34 AM
Hello,
This is definitely interesting. I would suggest opening a support case and see what they can find.
Regards,
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07-28-2020 10:11 AM
I will say check the objects, addresses then look for source and destination address.
Make sure under IP netmask it is 1.1.1.1
or 2.2.2.2
Regards
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07-28-2020 10:44 AM
Thanks for your reply, my concern is why the firewall deny traffic once i configure the security policy-1 and given the IP address in destination, however, once i created the object for the same IP address and allow in destination all are working fine.
This issue is occurring only for one IP address rest are working fine.
I am not able to find out the reason.
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07-28-2020 11:59 AM
You can do the PCAP on the firewall then you will have more info why PA is denying the traffic.
Regards
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07-28-2020 12:07 PM
I took the packet capture and found the SYN packet is going towards the server but didn't get any ACK from the server side.
then TCP retransmission packet has been captured.
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07-30-2020 07:35 AM
Just curious do you find solution for this?
Regards
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