CC3 to Vanilla now cant connect to internet through proxy
I dont know if anyone can help me with this but i would be very grateful if somebody could as its driving me batty!!
We are a school who have recently moved from RM CC3 to a vanilla network, the servers (DNS, DHCP) were setup by a company, but since the move I can't connect to the internet through staffproxy.swgfl.org.uk (which is an external proxy, which allows for lighter filtering for staff). We have gone from Server 2003 to Server 2008r2. We have a smartcache that goes through an alternative proxy for students which is more heavily filtered and once I added this to DNS its working fine, but the staffproxy....... proxy wont. When i run the connection troubleshooter it says about DNS not resolving the name.
I contacted SWGFL and they gave me a external DNS to use, I put this into my PCs DNS settings and it works, but i cant see why i have to use an external DNS because I went from 2003 to 2008r2. This is happening on all PCs and servers.
Is there a setting that I need to change on Server2008r2?
Any advice would be gratefully received, as when the staff come back if this is not working, I am going to get my a** chewed.