This problem has only started to happen over the past few days, and nothing has changed (that I am aware of) so struggling to see what has happened.
I have a network setup that all run off the same router. One of the machines on that network is used to host websites which runs Microsoft Exchange Server 2003 & IIS 6.0. I have domain names which I have purchased from various hosting companies and I have updated the DNS records at their end to point to my web server i.e. I have setup an A record to point to my web server IP.
Everything was working fine up until a couple days ago - now I can't access any of my sites via IP or domain name from any machine on the network! Can still get access publically & also if I am connected to the network via VPN I can access the sites. As far as I am aware no Firewall rules have been changed & no router configuration has been changed so this is really odd.
If I add the internal IP & domain name into the Hosts file on the server I can get access, however, this doesn't work for the sub domains....
Any idea's what this could be?