topic Re: Intermittent sites not loading in General Topics

Intermittent sites not loading

IT_Fleet — Thu, 14 Apr 2022 13:19:29 GMT

Having issues with palo alto pa-820. Some times when users try to load sites they just don't load. Wait some time and site usually loads. Some times it is fine, loads fast, users not getting any errors. No changes made to cause issue. Thinking it is something with dynamic updates? This started on the morning of 12-04-2022.

Re: Intermittent sites not loading

EHSErnesto — Thu, 14 Apr 2022 14:35:49 GMT

You need to monitor the traffic when it works, and when it doesn't in the firewall. You also want to do trace routes in both scenarios. See if for some reason it is falling down to a deny all. Also, not the protocol being used. I see the most issues when sites try to use quic.

Re: Intermittent sites not loading

IT_Fleet — Thu, 14 Apr 2022 15:03:29 GMT

Looking at -Logs -Traffic and my IP and not seeing any deny under Action.

Found this what does "resources-unavailable" under "session end reason" mean?

Management CPU seems to be at 100% all the time.

Re: Intermittent sites not loading

EHSErnesto — Thu, 14 Apr 2022 15:18:18 GMT

I think you just answered your own question there. Are you doing ssl decryption? Deep packet inspection?? Those are resource hogs.

Re: Intermittent sites not loading

IT_Fleet — Thu, 14 Apr 2022 15:30:35 GMT

Where do I turn off ssl decryption? can't get to kb article.

Re: Intermittent sites not loading

EHSErnesto — Thu, 14 Apr 2022 15:41:19 GMT

IF you are running it, it would be under objects->decryption pofiles. to see what's being used. Then check to see if you have anything under profiles->decryption.

Re: Intermittent sites not loading

BPry — Thu, 14 Apr 2022 15:45:13 GMT

@IT_Fleet,

Just simple things first, have you tried restarting since you noticed the issue to rule out a stuck process or other software issue? That would be the first thing I do if you suddenly start noticing a new introduced issue.

Rather than disabling decryption policies, I would highly recommend you start looking at traffic to see what's changed in the past two days to push your device past it's limits. Is their additional network traffic that isn't expected? Do you have a machine spawning a lot of sessions due to something being introduced on the machine? Don't diminish security of your environment without going through root cause to figure out why your device is being overloaded if it just suddenly changed.

Re: Intermittent sites not loading

EHSErnesto — Thu, 14 Apr 2022 19:17:09 GMT

Good point. Should have asked for more information.