Cookies are used within this forum for a number of things, the main one being the automatic login feature. When you click the ‘Log Me In Automatically’ box, the site will set a cookie with your information in. Next time you visit this forum, you should be automatically logged in - very handy!
It is very important however to ensure that cookies are allowed to be set - some firewalls and similar software applications will automatically delete cookies or prevent them being set in the first place and this will cause problems with login. If you are using such software, specify this site in the "Allow" list (www.alfagtv6.com).
If you are having problems, make sure that 2 cookies in the "www.alfagtv6.com" domain persist. They are called alfagtv6forum_sid and alfagtv6forum_data.
Try deleting all Offline files and then logging in again - this should always be your first attempt at solving login issues

Cheers,