open 
https://gitlab.synchro.net/main/sbbs/-/issues/958
Instead, these servers set the max user inactivity to a default (non-zero) value when set to 0 in sbbs.ini.
Just fix this in SCFG I think.
--- SBBSecho 3.29-Linux
 * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)