Actually, it can be done, but not without making modifications to the aspnet_ procedures. Changing the procedures will let you do exactly what you need, however, be very aware that these changes will be lost, and are not really advised unless you pay careful attention to them when upgrading - as they are modifications of the core sql.

If you choose to share these users between portals, it can be done quite easily actually. The limitation is caused because the aspnet_ application id's are not shared between portals. DNN integrated with aspnet membership model by using the PortalID as the ApplicationName with the aspnet_application table. To share users, you basically need to comment out the reference to the ApplicationID from within the procedures that specifically deal with selecting the list of users, or fetching users by name.  Once you comment out the specific areas where the Application ID is utilized, you will want to add a join in that joins on the UserPortal table - which will allow you to specify which users have access to which portal or portals.

It may take some time to look through and make some changes to the procedures, but it is well worth it - and it works! I have clients each with over 3,000 portals all sharing users between the portals.

Happy Nuking!

The  http://www.inventua.com passthrough module is what I'm using on my sites. I thnk you need to establish a master site first.. since synchronisation could run into a few challenges.

Hence, my http://www.xd.com.au website, for registered users  (this being because you need to transfer data and roles) allows you to be automatically signed in http://www.skincovered.com and http://www.modulereviews.com.

If you are logged into my site and click on the free skins page, there are two links to the sites which automatically register you.. and allow you to define a specific page on the new sites as a landing page.

It took me a bit to get going because I kept getting the settings reversed.but I have found it to be a very good way to handle multi site management. And I've gone down this path because I have heaps of information but can't seem get it working like I want on a personal website, but I can direct people to more specific information I'd like to share using this method and appreciate that it's very annoying to have to keep registering at times, so thought that Inventua came up with a great option - like all their modules - well written and useful.

Nina Meiers