I am writing you because I haven’t 
found solution on the web.
In order to secure a connection 
between servers (1 client and 1 server stunnel), I chose the stunnel tool. 
However, I have an issue when I unplugged the network 
cable.
If I unplug the network cable on the 
remote side, Stunnel will detect the cutting only on the local 
side.
In fact, I would like to configure 
stunnel client in order to detect the unplugged network cable on server 
side.
I tried many configurations but 
without success:
socket = 
l:TCP_NODELAY=1
socket = 
l:SO_LINGER=1:1
socket = 
l:SO_KEEPALIVE=1
socket = 
l:SO_REUSEADDR=1
socket = 
r:TCP_NODELAY=1
socket = 
r:SO_LINGER=1:1
socket = 
r:SO_KEEPALIVE=1
socket = 
r:SO_REUSEADDR=1
Could you help me? 
Thanks you in 
advance,
Alex