Tofsee TLS Fingerprint Detection


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L0 Member



Are you still experiencing hits for "Non-RFC Compliant SSL Traffic on Port 443?"  Threat ID 56112.  I have seen a large uptick in this activity since Palo Alto updated the threat on 11-19-2019.  Thanks.

L1 Bithead



We are still experiencing hits on that threat signature across multiple firewalls at this time. Due to the informational severity and recent holidays, I have not had a chance to investigate it much at all. I will probably end up opening a support case for clarification on this matter.

L2 Linker

Yep, we're seeing continual 'Non-RFC Compliant SSL Traffic on Port 44' alerts too, but nothing like the volumes seen on the Tofsee threat.

L2 Linker

I am seeing lots of alerts for 

Name: Non-RFC Compliant SSL Traffic on Port 443

Unique Threat ID: 56112


to which belongs to Facebook.  However, the device (android mobile phone) that is causing the alerts does not have facebook app installed.

PCNSC, PCNSE, Cyber Force Defender
L4 Transporter



Few Non-RFC Complaint signatures that was introduced in late last year and non-RFC Compliant SSL Traffic on Port 443(56112) is one of them. Please note that the main aim behind the signature TID 56112 is to detect suspicious and non-RFC compliant SSL traffic on port 443 or applications sending non-SSL traffic using port 443 or indicate possible malicious activity. 

You can capture the facebook traffic from the android device on your Firewall and check the traffic SSL protocol.




Himani Singh
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