Disconnected after inactivity

[starcraftcats]

OpenVpn is working great so far, so long as I don't walk away from the computer for too long. If I have an idle computer but the vpn is connected, the next morning the connection will not be working. The client I am using (the one that comes with the Openvpn download for windows) will still have green color. Also if I restart the server, the client will continue to be green colour but the connection won't work. The connection doesn't come back up either.

Is there some config I should change to keep the connection alive even when it is totally idle? The worst thing is not that the tunnel won't stay open by itself, but that the client still shows green as if the connection is running fine. If the client gui could indicate that the connection is down that would be much nicer.

port 8888
proto udp
dev tun

ca ca.crt
cert server.crt
key server.key
dh dh2048.pem

server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "redirect-gateway def1"
push "dhcp-option DNS 208.67.222.222"
push "dhcp-option DNS 208.67.220.220"

keepalive 10 120

tls-auth ta.key 0
cipher AES-256-CBC
auth SHA512
chroot /var/run/openvpn
comp-lzo

user nobody
group nobody

persist-key
persist-tun

status openvpn-status.log
log-append openvpn.log
verb 3

That's the server conf. And client:

client
dev tun
proto udp
remote xxx.xxx.xxx.xxx 8888
resolv-retry infinite
nobind
persist-key
persist-tun
mute-replay-warnings

ca ca.crt
cryptoapicert "THUMB:f47eeb682af0c7082efae060dbccb317ebdc1fae"

ns-cert-type server
tls-auth ta.key 1
cipher AES-256-CBC
auth SHA512
comp-lzo
verb 3

Thanks for any tips.

[Mimiko]

Add keepalive option to client as well. Also in device manager disable "Allow the computer to turn off this device to save power" for tun adapter and network adapter.