I have a multisite configuration in development and am having trouble with single signon functionality. I have tried a few modules and none have worked for my installation. There are numerous domains, single codebase, single database with no table prefixing. I am at the point of giving up and just hooking into the authentication and redirecting to all of the sites in order to drop the cookies and land the user back where they started... but would rather not do this. If anyone has any suggestions or ideas, I would love to hear it. Thanks.