WPF2B_EVENT_OTHER_UNKNOWN_PROXY

Attempted access via an untrusted proxy.

syslog	Facility	LOG_AUTH or LOG_AUTHPRIV
	Level	NOTICE
fail2ban	Filter	wordpress-hard.conf
	Rule	Untrusted X-Forwarded-For header from <HOST>

New in version 5.0.0.

See also

WP_FAIL2BAN_USE_AUTHPRIV