PuTTY: Software caused connection abort

Question

SSH

Hello.
For some reason lately PuTTY (as well as WinSCP on SFTP connection) started to give a "Software caused connection abort" error after about 3-4 minutes (maybe less) of downtime.
Apparently, it started after installing an SSL certificate (installed on nginx, behind it is apache2). I myself practically do not understand this environment (SSL / SSH), so I ask for help - could this affect the stability of the connection? If yes, does anyone have any idea how to fix this?
Versions: OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009, PuTTY: 0.62, default settings.
Thank you.

Answer 1

most likely on the server set a timeout for the session.
set PuTTY Session->Connection->Seconds between keepalives to 60
(so that PuTTY tells the server once a minute that it is still connected)

Answer 2

HTTPS (HTTP over SSL) is not related to SSH, and any settings on your web server do not affect SSH and vice versa. So it's a coincidence.