Proget not finding some Packages

We are experiencing problems with the Web package Search. Certain packages that we verify as being included in the package repository does not appear in the search.

Is there a way of rebuilding the indexes or change in configuration to redo the list of packages such that the search will pickup these missing packages?

First, make sure the service is running.

You can rebuild the index by setting RebuildPackageIndex to True in the All Settings page. It will rebuild within a minute or so.