I am working with AirVPN and MacOS X El Capitan and still have problems during sleepmode!
Normaly it itsn't a problem to connect to the MacServer during sleepmode! Until I am using AirVPN I tried different things like Third-party Software to be sure that the Mac never sleep and the VPN connection would be stable! But everytime when the screensaver starts after 10 minutes the connection will be disabled and block every attempt to access normaly until I quit AirVPN or start again a new connection.
Did anybody know this issue and have a workaround?