Synchronet v3.21e-Win32 (install) has been released (Mar-2026).

You can donate to the Synchronet project using PayPal.

This is an old revision of the document!


Log Files

Synchronet's servers and utilities can output status to a lot of different log files that are helpful for monitoring activity and debugging issues:

File Purpose
ctrl/csts.tab Cumulative statistics log, parsed/displayed by Synchronet and its utilities (e.g. SLOG, slog.js, sbbsctrl)
data/error.log Unexpected events that should be addressed by the sysop
data/events.log Event Thread activity from the Terminal Server
data/crash.log User activity before suspected crashes of Terminal Server nodes
data/guru.log User chat sessions with The Guru
data/hack.log Suspected hack attempts
data/hungup.log Users that disconnected while executing an external program on the Terminal Server
data/logon.lst Legacy list of terminal server user logons, preformatted
data/logon.jsonl List of terminal server user logons, used by logonlist module
data/sbbsecho.log SBBSecho (FidoNet EchoMail program) activity
data/spam.log Suspected SPAM delivery attempts to the Mail Server
data/logs/http-*.log HTTP access log from the Web Server
data/logs/<date>.log Terminal Server user activity
data/logs/<date>.lol Terminal Server user statistics upon log-off
data/logs/FS<date>.log FTP Server activity from sbbsctrl, optional
data/logs/MS<date>.log Mail Server activity from sbbsctrl, optional

The *.log files without a date in their filename support automatic and configurable rotation (e.g. via SCFG->System->Advanced->Maximum Log File Size and echocfg->Global Settings->Maximum Log File Size).

See Also