27 Nov 2008
28 Feb 2012
Link to this post
Sitefinity 4.x recognises only teh actual domain name that the license was registered against or localhost, anything else like IP Addresses will show the trial message, regardless whether you have access to teh internet or not. In 3.7 you were able to access via IP Address, in 4.x you cannot do that anymore.
So make sure you go to your Telerik account and download the correct license file for whatever version you are using, place it in the right place, and it will work.