time machine won't back up via ethernet
I have a MacBook pro that I travel with between offices and work travel. Previously I would use in my base office wirelessly via time machine. Worked fine for web access and my backups.
Recently we had to change some network settings in the office due to a new ISP and different configuration. Took some doing to get everything up and running, even a call to Apple tech support at one point because of firewall and ISP router settings to make it all play well with Apple products.
Because of the network changes I have had to change how I manage my laptop. I now plug in with my thunderbolt > ethernet adapter > cat 5 > to my time capsule. I can get to my office network and the internet this way wired, but when I try to get time machine to back up with ethernet cable only I get an error message saying the drive is not available.
Is it possible to use only the thunderbolt >ethernet cable >to time capsule connections to back up my Macbook?
I would rather not use the wireless to back up via time machine as it interferes with some of my other work slowing down some things.
I am also the lone mac in an office of PC's. Although some of my mac problems are more difficult to solve in this environment, I would have to say that the problems occur less than once every 18 months. Once fixed the Mac just works. I see the other computers in the office needing daily maintenance and settings changes and tech support at least 3 times a week.
Thanks to anyone who might be able to help.
Chris
MacBook Pro, Mac OS X (10.7.3)