Putty SSH solve inactive

That was the problem what my colleague encountered this morning. When
his Putty initiated SSH connection from outskirt to servers at HQ over
VPN connection, with a not-so-good dial-up networking, the VPN router
consistently disconnect / drop the SSH session whenever the idle
threshold triggered.

However, some of the client software might able to overcome the
restriction. For example, the Putty (wonderful Windows SSH client)
offers keepalive option to get rid of "VPN router disconnects idle
connection"!

[ Optional, only applicable if you want to save a SSH profile for
convenient ] Click on the Session category tree menu, enter Host name
or IP address of target host, select SSH protocol and gives it a
meaningful profile name in Saved Sessions text box.

Click on the Connection category tree menu, enter a non-zero digit
(indicates number of seconds) in Seconds between keepalives (0 to turn
off) text box.

Go back to Session category tree menu and click the Save button.

From now onwards, whenever you load this SSH session profile and click
Open button, the keepalive feature will be enabled to keep the
inactive / idle SSH session from disconnected by VPN router (that
enforce such rigid security practice).

So, if you're using Putty as Windows SSH client and encounter problem
of SSH disconnected after idle / inactive for some minutes, please try
to configure the keepalive option.