recently we have done some improvement to the sharepoint architecture, creating a Farm, and moving some site collection in other webapplication. Three of these site collection have had a lot of alert created, but after the move operation, the alert don't work. I've launched the stsadm -o updatealert command, and deployed the alertmanager 2007 solution to the new webapplication, but nothing changed. The only notification we receive is the alert creation's notifier.
How can i solve this issue?