Currently Being ModeratedApr 24, 2012 7:56 AM (in response to upctry2)
Not much detail to go on, there.
As a start, I'd call Comcast and ask them what they did (or didn't) do here.
Is this device a modem, or is it (also) a NAT, IP router, DHCP server, and firewall device; a gateway?
Are you attempting pings and connections to the server from the local network, or are you attempting pings and connections from a remote host out in the Internet?
Are you using the gateway device (if it's a gateway that you have, and that got swapped) for DHCP, routing and related tasks? If so, then those settings will need to be recreated.
Modems that aren't configured right don't pass connections to the remote network. Gateway devices provide more capabilities, and a failure to copy the old settings to the new device (because, for instance, the old device was dead) leaves you with the need to recreate the settings in the new gateway.
If somebody configured this network or this gateway for you, consider calling them in again.
Currently Being ModeratedApr 24, 2012 8:07 AM (in response to MrHoffman)
This device is a arris modem, we have turned off wiifi and have 2 phone lines connected to it. I am calling comcast to talk to them. but I am also just tryng to connect to the server over our local network. I have a airport extreame router.
Currently Being ModeratedApr 24, 2012 8:20 AM (in response to upctry2)
From what I see on the net, Various Arris Cable Modem devices are gateways. And if you were using the failed device as a gateway, then the new device probably doesn't have the proper settings for your local network; IP subnet, DHCP, DNS server, etc. Any of these can be wrong, and it'll look like an outage.
Most of the following might not help you as I'm inferring that you're not particularly familiar with IP networking. If that's the case, then I'd suggest getting somebody in to help you resolve this.
Some (more) questions.
Which model Arris cable modem device?
How is the Airport Extreme device connected to the server? Is it a wired connection, or wireless?
How is the Airport Extreme connected to the Arris device? Wired, or wireless?
Is the server configured at a static IP address? (It should be static, but I've seen folks try to use a dynamic address for a server.)
Is the Airport Extreme configured as a WiFi router (as was implied by your note), or is it configured and operating in a bridged (access point) configuration?
It would appear there is a network misconfiguration here; IP subnet setting, network mask, DNS server (which would usually be your local OS X Server box, if you're running OS X Server here and not a Windows or Linux or other server), or DHCP setting. Or there's no connection between the Airport Extreme device and the server; somebody's possibly left a wire dangling. What the details of that configuration error or the particular network set-up here might be, (sorry) I don't know.
Again, if you're not familiar with IP networking, then I'd suggest getting somebody local in to help re-establish your network.