PuTTY Serial `logout` or `exit` alternative

Question

When using PuTTY connected to a SSH session, upon entering exit or logout command, the connection is terminated and PuTTY is disconnected.

I'm designing an embedded ANSI/VT100 compatible terminal server, and I was wondering if there is a way to send something like a Break signal to PuTTY in order to make it disconnect and close the serial connection.

Is this possible? Or PuTTY doesn't handle serial connections in this way?

Solution

The logout command (exit command of the top-level shell sessions runs logout) does not send any command to PuTTY to terminate the connection. The logout command terminates the connection from server-side.

Check PuTTY event log after you type exit:

2017-10-16 08:10:38 Server sent command exit status 0
2017-10-16 08:10:42 Disconnected: All channels closed

Also, if you set Close window on exit to Never in PuTTY, you will get this after typing logout:

Comments

[David Refoua]

I tried sending 0 and 26 key codes for CTRL-Break, but it didn't work. Do you mean that it only works in SSH mode?

[Ina Kahn]

From what I read in that documentation link yes, here's what it said: Break Only available in SSH-2, and only during a session. Optional extension; may not be supported by server. PuTTY requests the server's default break length.