When receiving syslog messages, the message facility is reported wrongly.

RFC 5424

The Priority value is calculated by first multiplying the Facility
number by 8 and then adding the numerical value of the Severity. For
example, a kernel message (Facility=0) with a Severity of Emergency
(Severity=0) would have a Priority value of 0. Also, a "local use 4"
message (Facility=20) with a Severity of Notice (Severity=5) would
have a Priority value of 165.

While the sending part of syslog4j is doing things right, the receiving part is not, and
SyslogUtility fails to properly decode the facilities due to wrong constants in SyslogConstants.