Mac Mini Server 2010 Networking issues

I cannot get a consistent connection to my wireless router over Wi-Fi or when wired. It seems like the firewall is getting in the way because I can get a connection if I turn it off, but then once connected I can switch the firewall back on and it works. Having turned the firewall off and then back on again I can even then disconnect and reconnect the cable and it works for a while (I have made it inactive and then active again which also works) until some time later after a longer period of inactivity the whole connection issue starts again.
The network in use has been and still is a solid network for the plethora of MacBooks, XP, Windows 7, Linux machines we use so I can only assume it is some kind of setup issue. I would really like to start the Server Setup wizard again or re-install as I think something may have gone wrong right at the outset. As it doesn't have a DVD drive I am not sure yet how I could reinstall.
Thanks for any help you can provide.

I solved this by scouring the firewall settings. So, to share what I found:
When using DHCP to assign an IP address for the OS X Server, without any of my own services running (eg. DHCP/DNS/Web etc) the firewall decided to not enable the DHCP and BOOTP Client ports, causing my DHCP requests to not function correctly. Checking the DHCP and BOOTP Client setting made the networking problems disappear.
Sounds obvious once it is discovered!!

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