My Apple OSX server (Mountain Lion) at home is the centre of my network and entertainment system. It provides provides the following services:

• DNS
• DHCP
• VMWare Server platform (VMWare fusion)
• Air Video HD Server (for streaming video over the network)
• General Internet download station

Since several (soft-, and hardware) upgrades and redesigns of my internal network (from a single VLAN to a multi-VLAN with firewall services and traffic inspection) several services failed under certain circumstances. E.g. Air-Video would work internally where the client was in the same network as the OSX server network interface. But trying to connect through the SSL VPN stopped working for some reason. Also, the VNC Viewer did work in the old days, but stopped working over time. Same for several static NAT entries; worked before, and stopped working without 'no reason'. Other services like ssh did work in the old and new network design....