Hi All, We have about 20-30 Intel Mac Pro's here running Snow leopard, they connect to our windows active directory servers to handle authentication. Now the way the company works is that we have a 'standard' network and a 'secure network' - that gets assigned to these macs depending on which project the guys are working on. It tends to switch around every few weeks. Both networks have access to the AD servers, and their DNS services respectively, and the networks are switched by tagging/ untagging the vLans (so no hard patching / cables move). Now whenever we go from the 'normal' network to the 'secure' network, Active directory becomes 'unavailable' until someone goes over to rebind it to the AD server (so it does connect/ work.etc, it just needs an admin). Is this normal on macs? or are we doing something wrong, as its pretty tedious having to send someone over each time a staff member switches project. Incidentally the two windows machines we have don't have this problem - they just let you move them and are happy, which leads me to think we are doing something wrong in our setup/ config. Many thanks in advance!