Last night a Windows update ran on our server running Windows Server 2008 R2 and this morning we couldn't RDP into the box or access the sites that it hosts. The hosting provider could RDP into it though. They disabled the firewall which fixed the issue, allowing us to RDP into it and bringing the sites back online.
This happens whenever we install a Windows update -- the server reboots and, because of changed firewall settings, is inaccessible to anyone but the hosting provider after it comes back on.
How do we prevent this? What's causing it to happen?