Is there any possible way to suppress the " ... released a r/w session" messages in a serial connection?

Digi CM & Passport
,
1

The suppress connection announcements is already enabled (Digi Passport 48 with v1.5.0).

2

Yes, the can be suppressed through the web’s for CLI config:
Serial port – Configuration – User access control – Suppress connection announcements = enable

Thanks,

Ron
Digi Tech Support