Today's Win 7 problem has to do with Win 7's well intended network location security. When you first connect to a WiFi network Win 7 asks you to choose a network location. If you choose Public some network tools won't work -- including my corporate RSA IE toolbar.
After you connect, however, it's not obvious how to switch from Public to Work. The secret is to
- Go to Control Panel:Network and Internet:Network and Sharing Center
- Click on the hyperlink-like text that says "Public"
- In the new window choose Work or other trusted network