If you find you cannot make any network connection at all, your computer may need some initial changes to its networking configuration before you can successfully connect to the college network, particularly if you have it configured in a specific way for a home network for example.
For more detailed configuration settings go to http://qm-web.its.qmul.ac.uk/halls/ or download TechNote 7
Note: When using central college usernames, if you have anything other than just qmul.ac.uk after the @ sign, it will not work.
However, for those using departmental eduroam authentication, where your username takes the form 'dept.username' (e.g. dcs.rclarke) you will need to move the department code to after the @ sign when logging into eduroam, using the format username@dept.qmul.ac.uk (e.g. rclarke@dcs.qmul.ac.uk).
Even if you have changed your password in that time, changing it again anyway will eliminate password problems as a possible cause of connection failure. You can actually 'change' it to the same password as it is just the change process which will fix any problem, not the password itself.
This has been noted in a situation where more than one Wireless Manager programme was running, and wireless authentication settings were only offering 802.1X-WEP. Ensure that you are running only one wireless manager and that you are configured to authenticate using WPA2.
There is an issue with the Dell Minis connecting to WPA2. To resolve this, ensure that you have the latest updates installed by running 'apt-get upgrade'. For further information, there is a discussion of the issue on the Dell forums.