You should enter your domain name with a period in front. For example, if your forum is at <i>http://www.your-domain.com/forums/</i>, you'd enter:<br />
<b>.your-domain.com</b><br />
<br />
Be sure not to include anything in front of the first period or after the domain extension.<br /><br />
If you are using a subdomain, such as: <i>http://forum.your-domain.com</i>, your should enter:<br />
<b>.forum.your-domain.com</b>