Configuring Snort Intrusion Prevention System (IPS) in pfSense CE firewall to send intrusion alerts to Kiwi Syslog Server Free Edition

Subject: Configuring Snort Intrusion Prevention System (IPS) in pfSense CE firewall to send intrusion alerts to Kiwi Syslog Server Free Edition


Good day from Singapore,


Author: Mr. Turritopsis Dohrnii Teo En Ming

Country: Singapore

Date of document: 22 Nov 2025 Saturday


Detailed steps are shown below.


Kiwi Syslog Server Free Edition

=================================


Download and install Kiwi Syslog Server Free Edition as a Service. Don't install as an Application.


Open Kiwi Syslog Server Console


File > Setup > Inputs


Receive messages from below IP addresses:

192.168.1.1 <- pfSense firewall IP address


File > Setup > Inputs > UDP


Check Listen for UDP Syslog messages


UDP Port (1-65535): 514

Bind to address: Leave empty

Data encoding: System


File > Setup > Rules > Default > Actions > Log to file


Path and file name of log file:


D:\Syslog\SyslogCatchAll-%DateISO.txt


Log file format:


Kiwi format ISO yyyy-mm-dd (Tab delimited)


Allow firewall rules on Windows for UDP 514


Configure pfSense System Logging

===================================


Login to your pfSense firewall.


Status > System Logs > Settings


Under Remote Logging Options section


Enable Remote Logging: Check Send log messages to remote syslog server


Source Address: LAN


IP Protocol: IPv4


Remote log servers: 192.168.1.101:514


Rermote Syslog Contents: Check Everything


Click Save.


Enable Snort > Syslog Output

=============================


Services > Snort


For WAN interface, click the pencil (edit) icon.


Under WAN Settings


Under Alert Settings


Send Alerts to System Log: Check Snort will send Alerts to the firewall's system log.


System Log Facility: LOG_AUTH


System Log Priority: LOG_ALERT


Click Save.


Windows Firewall Rule for Kiwi Syslog Server

=============================================


On the Kiwi server:


Create inbound rule:


Protocol: UDP


Port: 514


Action: Allow


Otherwise pfSense firewall logs will never reach it.


Reboot pfSense firewall.


I have completed all of the above steps on 20 Nov 2025 Thursday at 10.40 PM Singapore Time.


Regards,


Mr. Turritopsis Dohrnii Teo En Ming

Singapore

22 Nov 2025 Saturday 11.28 am Singapore Time





REFERENCES

===========


[1] https://lists.freebsd.org/archives/freebsd-amd64/2025-November/000228.html


[2] No more updates from mail-archive.com


[3] https://marc.info/?l=freebsd-amd64&m=176378201632729&w=2


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