HA Upgrade Path 8.1 to 9.1

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

HA Upgrade Path 8.1 to 9.1

L3 Networker

I have an HA pair of firewalls on 8.1. Do I need to upgrade both to 9.0 and then 9.1 or can I upgrade one all the way to 9.1 and then the second from 8.1. to 9.1?


Cyber Elite
Cyber Elite

Hi @MikeSangray2019 ,


As you're planning to upgrade from one feature release to later feature release, you can't skip installation of the feature release which is in the path. So in your case, you need to follow below upgrade path -


8.1-->9.0-->9.1.0 (Download Base Release)-->9.1.x (Download & Install Target Version)


Also it is recommended to install latest maintenance release in each release version before you install the base image of next feature release. So you can follow upgrade path given in below article.




Hope it helps!



I understand the path, my question is about HA.


Can I upgrade one of the firewalls all the way to 9.1 and then upgrade the second firewall to 9.1 or do I have to do one to 9.0, then the second to 9.0, and then upgrade to 9.1 on the first and then 9.1 on the second.

Hi @MikeSangray2019 ,


Apologies for my misunderstanding!


As per Palo Alto guidelines, if there is more than one version difference between HA gateways then it gives errors. And the error will be like 'Peer version too old'. 

  • 3 replies
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!