topic Re: Application incomplete in General Topics

Application incomplete

SOC_CSG — Thu, 05 Mar 2015 17:39:02 GMT

Hi,

Why Palo Alto is detecting sometimes the application like SSL and sometimes like incomplete??????

if the connection has 134bytes is not detected, but with more than 134b is detected..........

Re: Application incomplete

hshah — Thu, 05 Mar 2015 19:10:53 GMT

Hi COS,

application "incomplete" means un-complete three way handshake.

Application "ssl" means firewall has seen complete three way handshake and couple of packets after that.

Now in logs you can also see "how many packets are sent and receive".

for incomplete application you will see that not more than 3 packets were exchange in two direction.

To verify it enlarge every log.

Regards,

Hardik Shah

Re: Application incomplete

hshah — Thu, 05 Mar 2015 19:28:56 GMT

Hi COS,

You can also refer bellow document.

Incomplete, Insufficient data and Not-applicable in the application field

Regards,

Hardik Shah

Re: Application incomplete

SOC_CSG — Thu, 05 Mar 2015 19:37:42 GMT

Yes i know but why the system App would start connections with less of 3 packets, thats not make sense right?

Re: Application incomplete

hshah — Thu, 05 Mar 2015 19:44:52 GMT

Hi Cos,

That can be answered through packet capture or enlarged version of log.

Please provide me, it will help me with the analysis.

Regards,

Hardik Shah

Re: Application incomplete

SOC_CSG — Thu, 05 Mar 2015 19:54:43 GMT

Ok ill do a packet capture and ill let u know....thanks

Re: Application incomplete

hshah — Thu, 05 Mar 2015 20:00:36 GMT

Thanks COS ...

Re: Application incomplete

MP18 — Sat, 27 Oct 2018 05:11:18 GMT

i see incomplete application with more than 3 packtes in either direction

Re: Application incomplete

LukeBullimore — Sat, 27 Oct 2018 18:13:28 GMT

@MP18 Application incomplete can also mean that the three-way-handshake completed but there wasn't enough data afterwards to be classified into an App-ID, hence incomplete.

Just in example, the tcp three-way-handshake could complete but then all the following packets are just TCP keepalives or something.

Packet captures will provide the answers you seek 🙂

Re: Application incomplete

DominickHernandez — Mon, 03 Dec 2018 14:48:09 GMT

I'm having this same issue with telnet on port 8080. From one server to the other it will connect for a second and then say the remote host closed the connection.

Any ideas?

Rule

Packet Capture

WireShark