Alternatively you can set the keep alive feature in PuTTY to 60 seconds to prevent your network card from going into stand-by mode. To do this open PuTTY, select your session, click "Load", click "Connection", set "Seconds between keepalives" to 60, click "Session", then click "Save".
If your PuTTY disconnects when you are actively using it please contact your POC to help troubleshoot the issue.