Hey Guys, Running a 2k3 domain and DNS servers and i'm attempting to make use of subnet prioritisation. Setup - 3 subnets in physically separate networks on a private WAN 1.0.0.0/22 - dns1.local = 1.0.0.1, proxy1.local = 1.0.0.2 1.0.4.0/23 - dns2.local = 1.0.4.3, proxy2.local = 1.0.4.4 1.0.6.0/23 - dns3.local = 1.0.6.5, proxy3.local = 1.0.6.6 I have an A record set up for the proxy servers - proxy.local that has 1.0.0.2, 1.0.4.4 and 1.0.6.6 Generally the setup works for about 20 minutes or so (clients that is), before the browser starts attempting to use a proxy in a different subnet. ie. Desktop1.local = 1.0.0.10, configured with a proxy of proxy.local will use 1.0.0.2 (correctly) for a while then suddenly stop working (normal browsing patterns - my machine). nslookup shows that proxy.local is returning proxy3.local instead of the 'subnet prioritised' one. Do I need to switch off round robin dns resolution? I'm a bit lost - the only documentation i've been able to local is http://technet.microsoft.com/en-us/library/bb457118.aspx - and that appears to say that RR and SP co-exist with SP having priority. Perhaps i'm missing something simple in the setup? All theories welcome. Thanks in advance Carl Gherardi

Sorry to bump - perhaps i've posted in the wrong forum?

Hi, Please try to disable DNS Round Robin to test. For your reference: Configuring Subnet Prioritization http://technet.microsoft.com/en-us/library/cc961422.aspx Also run "ipconfig /flushdns" on client machines and run " dnscmd ServerName /clearcache" on DNS server to clear cache and test. Thanks.This posting is provided "AS IS" with no warranties, and confers no rights.