topic NFS sessions undecided after fail-over in General Topics

NFS sessions undecided after fail-over

Gun-Slinger — Wed, 30 Oct 2019 19:45:06 GMT

Situation:

NFS Client src:828 dst: 2049 --> PAN 7050 HA Cluster --> NFS Server (NFS Session is up and connected without issue)

Palo alto cluster fail-over occurs (upgrade/issue - doesn't matter)

NFS Client src:828 dst:2049 -->PAN (Session is marked as "undecided" and dropping the syn packets)

The timer continues to reset on the session on PAN since the client continues to send syn packets which are dropped. This keeps the session opened until the session is manually cleared by engineers on the PAN cluster.

Is anyone else experiencing this? We haven't seen this occur on any other apps except NFS and seemed to start around 8.1.7.

Re: NFS sessions undecided after fail-over

IAC_SIC — Wed, 23 Jun 2021 11:08:51 GMT

I am having the same issue with PA-5220 and latest available version PANOS 9.1.10

Re: NFS sessions undecided after fail-over

DineshPal — Thu, 02 Jun 2022 09:15:09 GMT

Yeah experiencing the same issue. Did you get the root cause ?

Dinesh

Re: NFS sessions undecided after fail-over

Maur73G — Fri, 03 Feb 2023 20:33:58 GMT

Hello guys

Did you resolve this issue? I have experienced the same situation and apparently, we have a problem with NFS reuse sessions, it seems to be a native function on recent Linux Distros like says on the following article:

https://www.suse.com/support/kb/doc/?id=000019722

On PAN-OS what can I do? The only chance would be an App-Override?

Re: NFS sessions undecided after fail-over

Gun-Slinger — Tue, 07 Feb 2023 14:31:36 GMT

The only way we were able to resolve this was through a custom app / app-override policy. This allowed us to artificially adjust the timers on the sessions for this particular traffic.

Here it is almost 4 years later and no change except a work-around. I had mentioned the idea of a FR to have the NFS signature updated to accommodate this Linux change but no success has been seen yet.

Re: NFS sessions undecided after fail-over

IAC_SIC — Tue, 07 Feb 2023 15:33:19 GMT

I am agree with you,

Palo Alto has a bad performance with chatty protocols as NFS. In the past I made benchmarks with NFS app-override having best performance but this shouldn´t be the right way.. I am hoping for better chatty protocols recognition by Palo Alto.

Kings regards, Jorge Goya.

Re: NFS sessions undecided after fail-over

PktBlocker — Fri, 23 Jun 2023 15:08:38 GMT

Hey Gun-Slinger, we are running into the same issue on our 3220 which just got upgraded from 9.1.13h1 to 10.1.9-h1. Can you share the details of the custom appid ?

Re: NFS sessions undecided after fail-over

Gun-Slinger — Fri, 23 Jun 2023 16:29:49 GMT

Hey @PktBlocker , sure see below