Hi Everyone,
With regard to accessing the 3D Warehouse through a firewall, make sure the following items are open:
http://sketchup.google.com/3dwarehouse (port 80)
http://www.google.com/accounts (ports 80 and 443)
Hi jjanke81,
As a test, export the SketchUp file as KMZ, then open a browser and click the "Upload" button in the upper right-hand corner. See if you can upload the KMZ manually.
Regards,
SGT