If you are runnig ifconfig, do you see an ip address starting with 169…, or a valid configuration?
How many hops do you get when trying traceroute google.com?
Are you able to ping the server ip address from another machine? If no, then running a traceroute from that pc, how many hops do you get?
Another important tip to check is here:
Account provider refused connection - #13 by davidep
You might also want to check your server hardware: I happen to have a ProLiant DL360 G7 where i originally had proxmox running. Since NS7 needs NIC passthrough, this wont work with my hardware due to bios limitation. Hope your hardware does not have those.
Did you had time to run these?