Explanation
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClibCAC Incomplete in the application field: Incomplete means that either the three-way TCP handshake did not complete OR the three-way TCP handshake did complete but there was no enough data after the handshake to identify the application. In other words that traffic being seen is not really an application. One example is, if a client sends a server a SYN and the Palo Alto Networks device creates a session for that SYN , but the server never sends a SYN ACK back to the client, then that session is incomplete.

Explanation
Generate a CA certificate for Forward Trust (step 2) a self-signed CA for Forward Untrust (step 4)
https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/decryption/configure-ssl-forward-proxy

Explanation
According to Palo Alto Networks documentation123, multi-factor authentication (MFA) is a method of verifying a user's identity using two or more factors, such as something they know, something they have, or something they are.
The firewall supports MFA for administrative access, GlobalProtect VPN access, and Captive Portal access.
The firewall can integrate with external MFA providers such as RSA SecurID, Duo Security, or Okta Verify.
The three firewall MFA factors that are supported by PAN-OS are:
User logon: This is something the user knows, such as a username and password.
One-Time Password: This is something the user has, such as a code generated by an app or sent by email or SMS.
Push: This is something the user is, such as a biometric verification or a device approval.

Explanation
Example output:
> show system state filter-pretty sys.s1.p1.phy
sys.s1.p1.phy: {
link-partner: { },
media: CAT5,
type: Ethernet,
}
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000Cld3CAC