We had an issue reported to us about Dynamic IP Restrictions Beta module failing with long site names on the iis.net forums. We have a patch available that will fix this issue. Please install the patch (.msp) from the link in the download pages below if you have installed the Beta prior to June 8 2009 (v 7.1.394.0). We have updated the Beta installer (.msi) so that all downloads now already include the patch.
Landing page: http://www.iis.net/extensions/DynamicIPRestrictions (look on the right for links to the patch)
x86 installer: http://www.iis.net/1825/ItemPermalink.ashx
x64 installer: http://www.iis.net/1826/ItemPermalink.ashx
For those who used the Web Platform Installer to install Dynamic IP Restrictions Beta, an update will be offered through Web Platform Installer as well.
Please report any issues with the update on the IIS7 security forum.