App-ID and HTTP/2 Inspection
Table of Contents
App-ID and HTTP/2 Inspection
Palo Alto Networks firewalls can inspect and enforce
security policy for HTTP/2 traffic, on a stream-by-stream basis.
You can now safely enable applications running
over HTTP/2, without any additional configuration on the firewall.
As more websites continue to adopt HTTP/2, the firewall can enforce
security policy and all threat detection and prevention capabilities
on a stream-by-stream basis. This visibility into HTTP/2 traffic
enables you to secure web servers that provide services over HTTP/2,
and allow your users to benefit from the speed and resource efficiency
gains that HTTP/2 provides.
The firewall
processes and inspects HTTP/2 traffic by default when SSL decryption is enabled.
For HTTP/2 inspection to work correctly, the firewall must be enabled
to use ECDHE (elliptic curve Diffie-Hellman) as a key exchange algorithm
for SSL sessions. ECDHE is enabled by default, but you can check
to confirm that it’s enabled by selecting .
When the Decryption
logs introduced in PAN-OS 10.1 are enabled, you must enable Tunnel Content Inspection to
obtain the App-ID for HTTP/2 traffic.
You can disable
HTTP/2 inspection for targeted traffic, or globally:
- Disable HTTP/2 inspection for targeted traffic.You’ll need to specify for the firewall to remove any value contained in the Application-Layer Protocol Negotiation (ALPN) TLS extension. ALPN is used to secure HTTP/2 connections—when there is no value specified for this TLS extension, the firewall either downgrades HTTP/2 traffic to HTTP/1.1 or classifies it as unknown TCP traffic.
![]()
- Select and then select Strip ALPN.Attach the decryption profile to a decryption policy () to turn off HTTP/2 inspection for traffic that matches the policy.Commit your changes.Disable HTTP/2 inspection globally.Use the CLI command: set deviceconfig setting http2 enable no and Commit your changes. The firewall will classify HTTP/2 traffic as unknown TCP traffic.
