# [LIBDFWD_UNKNOWN_MESSAGE_SUBTYPE](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_UNKNOWN_MESSAGE_SUBTYPE)

## SYSLOG Details
- **Message**: Invalid <variable>message-type</variable> message sub_type = 0x<variable>address</variable>.
- **Help**: Unknown message subtype received
- **Description**: libdfwd encountered that an unknown message subtype code is received that does not matches with any of the existing cases.
- **Type**: Internal: Internal log message
- **Severity**: error
- **Cause**: -
- **Action**: Contact your technical support representative.
- **Attributes**: message-type
address
- **Facility**: LOG_DAEMON

## Found this message in the following releases:
- [Junos OS 24.2R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_UNKNOWN_MESSAGE_SUBTYPE&sw=Junos%20OS&rel=24.2R1)
- [Junos OS 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_UNKNOWN_MESSAGE_SUBTYPE&sw=Junos%20OS&rel=23.4R1)