SSL inbound inspection

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L4 Transporter

SSL inbound inspection

Hi Team,

I am facing the issue in SSL decryption intermittently. For the transaction website.

 

traffic flow for the SSL inspection is:-

 

Outside user ------> Paloalto--------->Load balancer-------->Application server.

 

In the destination NAT translation, i have given the load balancer IP.

 

Condition A with SSL inspection:-

Once we apply SSL inspection we can see the application webpage is open properly but some time transfer page was showing blank.

We tried to do transactions multiple times and it was successful sometimes and sometimes stuck on-page.

 

Condition B without SSL inspection:-

Everything is working fine.

 

Troubleshooting:-

Below is the counter value:-

 

ssl.PNG

 

I just found this error in counter but not able to understand what is the exact issue.

Could you please give me any sugesion in this.

 

 

 

 

Highlighted
Cyber Elite

@Jafar_Hussain,

What session_end_reason were you getting on the sessions that were giving an error? On your decryption profile, what options if any do you have checked under SSL Inbound Inspection? 

Highlighted
L4 Transporter

@BPry 

When i login in website page the decryption showing traffic is decrypted. after login once i click any functionality like transaction the traffic is showing decrypt-error.

didn't apply any decryption profile, it is none.

Highlighted
L4 Transporter

@BPry 

I analyze the packet capture and found below:-

 

1 - Paloalto only support limited Elliptic curves which are received by server hello:-

 

Jafar_Hussain_0-1597909856483.png

bu in this packet capture i am not able to find any Elliptic curve detail.

Supported elliptic details are below:-

Tags (1)
L4 Transporter

@BPry 

I want to add one more point, i have analyzed the counter again and found the below value:-

 

 Number of ssl sessions can't be decrypted because of out of resources proxy_l2hdr_extended 13 1 info proxy pktpro

 

apart from this 9 other SSL inbound policy is working perfectly.

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