Phone: +43-1-5851414

SL4NT is an application which implements a syslog daemon. The purpose of a syslog daemon is to listen for incoming syslog messages from syslog senders - like Unix hosts, routers, firewalls, etc. - and then decode and process the messages for logging and notification purposes.


  • Implemented as a multithreaded service
  • Support for asynchronous message processing
  • Receiver engine supports listening on multiple UDP/TCP ports
  • Rule based message processing
  • Support for trigger threshold settings
  • Supported rule conditions:
    • Facility
    • Priority
    • Source IP-address
    • Destination IP-address/port
    • Receive time
    • Substring search in message text/Regular Expression matching
    • Custom evaluator object (implemented as an ActiveX object)
  • Supported rule actions:
    • Log message to Windows NT Event Log (Application, System)
    • Log message to log file
    • Run program
    • Send network alert (requires Windows NT/2000/XP/Server 2003)
    • Send email (SMTP) message (MIME 1.0 compliant)
    • Forward syslog message to another syslog daemon
    • Log message to an ODBC database
    • Forward message to viewer (any Telnet client)
    • Execute custom handler (implemented as an ActiveX object)
  • Completely customizable log format
  • Support for automatic log file purging based on file size
  • Support for automatic creation of new log files periodically (hourly, daily, weekly, monthly) or when a particular file size has been reached
  • Support for IP-address to hostname resolution with caching for resolved mappings
  • Performance Counter Extension
  • MMC Snap-In (SL4NT Manager) for local and remote administration
  • Support for generating syslog messages for testing or troubleshooting purposes
  • Support for saving/restoring service configurations to/from text files
  • Support for configuring the syslog service using configuration files
Supported OS: All Windows versions since Windows NT 4.0, up to and including Windows Server 2012R2. For SL4NT 3.2 to be supported on Windows Vista/Server 2008 or later, SL4NT 3.2 Service Pack 1 must be applied.
Software Type: Trialware (60 days)

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File Size Content
SL4NT32.ZIP 1.09 MB
  • SL4NT 3.2
  • Documentation (HTML Help) only. This file is included in the product distribution file SL4NT32.ZIP. You will download this file in case that you want to take a look at the documentation before installing the product.
  • Note: If you download the documentation separately, you must unblock the file after downloading it: Right-click on the downloaded file and select the Properties menu item. Then click on the Unblock button.
  • SL4NT 3.2 Service Pack 1. SL4NT 3.2 SP1 must be applied for SL4NT 3.2 to be supported on Windows Vista or later.
  • SL4NT 3.x Software Development Kit (SDK) - Revision 2. You only need the SL4NT SDK if you want to develop your own custom extension objects.
RFC3164D.ZIP 12 KB
  • RFC3164 Decoder. Implementation of a custom rule evaluator object for parsing and decoding the message text of syslog messages according to RFC3164. The source code for this custom rule evaluator object is contained in the SL4NT 3.x SDK.
Uninstall Instructions

SL4NT can be uninstalled by:

  • Open the MS Windows Control Panel
  • Select 'Uninstall a Program'
  • Find SL4NT in the list of programs and double click on it
  • Click the 'Uninstall' button in the SL4NT Uninstall window