topic Re: Troubleshooting Application Incomplete with two way TCP traffic in General Topics

Troubleshooting Application Incomplete with two way TCP traffic

MP18 — Tue, 29 Jan 2019 02:04:09 GMT

We are having issues with one application while migrating the network from ASA to PA

PA is Running 8.0.9 on 3020.

Application shows as incomplete with more than 4 packets.

We see trasmit and receive in the PA.

Nothing in threat logs.

As per TAC they say use App override as first step and then flow basic and content basic.

Will do this once gets test window from the client.

Need to confirm if this is best way to troubleshoot this.

Re: Troubleshooting Application Incomplete with two way TCP traffic

LukeBullimore — Tue, 29 Jan 2019 13:25:32 GMT

Hey Mike

I would see if you can get a packet capture for this type of traffic; see what the traffic actually is. If you're noticing patterns then you can even create your own App-ID and custom signature for the traffic you have here.

https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-admin/app-id/use-application-objects-in-policy/create-a-custom-application

Otherwise, application override is probably your best bet.

Thanks,

Luke.

Re: Troubleshooting Application Incomplete with two way TCP traffic

MP18 — Wed, 30 Jan 2019 02:21:37 GMT

will test with app override and see how it goes

Re: Troubleshooting Application Incomplete with two way TCP traffic

BPry — Wed, 30 Jan 2019 04:08:14 GMT

@MP18,

An application-override rulebase entry will work; however, I'd highly recommend using that only as an intermediate step before doing what @LukeBullimore mentioned and just building your own application signature for this traffic. Since you already mentioned that you have to wait for a maintenance window as is, I would pursue a custom app-id in the meantime.

Re: Troubleshooting Application Incomplete with two way TCP traffic

MP18 — Wed, 30 Jan 2019 04:10:41 GMT

will look for custom app also

in curent scenario we see tcp retransmissions as PA does not see return traffic from client.

can you please redirect me to best document for custom app?

Re: Troubleshooting Application Incomplete with two way TCP traffic

BPry — Wed, 30 Jan 2019 04:23:57 GMT

@MP18

https://docs.paloaltonetworks.com/pan-os/7-1/pan-os-admin/app-id/create-a-custom-application

Re: Troubleshooting Application Incomplete with two way TCP traffic

MP18 — Wed, 30 Jan 2019 04:25:23 GMT

Many Thanks!