In our area there is no cable co. that offers a static ip {comcast,vista,frontier}
They offer usually only dhcp service and that is the connection choice you should make in your initial console setup. If in fact you do have a static ip address then you must enter the gateway ip address as well as the dns server ip address when prompted for "select master dns server address" and manually enter them in console configure mode.
then set clients to obtain and all should be ok. go to server manager and check review configuration and make sure your wan interface shows the correct ip info for staticip,gateway,dns.
billmakr