Manual Chapter : Description of log levels for QUIC log messages

Applies To:

  • BIG-IP LTM

    15.1.9, 15.1.8, 15.1.7, 15.1.6, 15.1.5, 15.1.4, 15.1.3, 15.1.2, 15.1.1, 15.1.0

back-action Logging QUIC messages

Updated Date: 04/21/2026

Description of log levels for QUIC log messages

This table describes each log level and gives some examples of messages that might be logged for each log level.

Level

Description

Sample log messages

Critical

Non-protocol-related errors that would preclude healthy operation of the traffic filter.

 
hud_quic_init errors
quic_init errors
TLS errors
Stream initialization errors
Closing connection with INTERNAL_ERROR

Error

Protocol-related errors that would prevent a connection from proceeding as expected.

 
Encrypt/decrypt errors; AEAD errors
CONNECTION_CLOSE that is not of error_code=0x0 (NO_ERROR)
Packet parsing errors
Frame parsing errors
Packet drops due to parsing or memory allocation issues
Host unreachable

Warning

Protocol-related issues that don’t necessarily violate the spec, but which may result in sub-optimal connection.

 
Missing transport parameters
Address validation errors

Notice

Connection-level logging.

 
New connection established (log src, dst IP:port and connection IDs, token)
Connection state changes (transition from initial->handshake->1-RTT)
Congestion control enabled/disabled
Connection terminated
Retry limits (or other thresholds exceeded, similar to SYN cookie activation/deactivation)
Initiation of address or path validation
Success/Failure of path validation (and reason for failure)
Sending VN
Connection migration detected
Connection lookup messages
Packet drops due to being in the wrong state

Info

Stream-level logging.

 
Stream establishment
Stream state changes
Stream reset/close

Debug

Other.

 
TLS key material
Log secrets, sufficient to generate an SSLKEYLOG file for use with wireshark
xbuf_move errors
Other miscellaneous logging