Sometime corrupted ARP table can cause serious pain as it can stop server to communicate on the network, The Simple way supported by almost all windows :
netsh interface ip delete arpcache
Then to make sure it is empty view the ARP cache :
arp -a
To restore it fast ping the broadcast :
ping xx.xx.xx.255
You can also just arp command to delete the table, type as administrator :
arp -d