I guess Username / password would be needed in combination with a proxy server. So I assume your company uses one. Here's what to do:

- Manually close the connection with the accesspoint/wlan router.
- Goto the main menu, Tools, Connection manager
- In connection manager click the menu (left upper), Tools, Connectivity settings.
- Click the button Connections
- Mark your business connection and click Edit
- Next, Next, Next and click Advanced
- Enter your company's proxy settings

It should work now.

The location of those settings is stupid, I know.