I am attempting to use stunnel to provide secure telnet access to a
server on my system. As it is possible that a user may be idle for long
period I have attempted to enable keepalive with stunnel. My stunnel
conf files contain:
socket = l:SO_KEEPALIVE=1
socket = r:SO_KEEPALIVE=1
on both the server and client side. But wireshark shows no keepalive
packets being exchanged. I am using socat to provide a service on the
LAN and connections using socat do show keepalive packets. But to get
this working with socat I had to use the following:
socat -d -d -L/var/lock/Port$PORT -
TCP:127.0.0.1:$PORT,keepalive,keepcnt=10,keepidle=3,keepintvl=1
I had originally tried it with only the keepalive option, but it took
adding the other three options for it to work. Perhaps this is
particular to my linux mint 13 maya x64 system and keepalive works by
itself on windows? Are the other three options supported in stunnel?
Dave
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