It is necessary to tune the TCP keepAlive on the SSL port.
For this open the Listen port section and click on your listen port that decrypting SSL sites.
On the TCP Keepalive timeout, click on the “Modify” icon
Define these values:
Idle
: 60 seconds.
Interval
: 30 seconds
Timeout
: 3 seconds
After Click on
Reconfigure ports and restart service