I have one forum installation installed at http://noobist.com/community. The website noobist.com is part of a WordPress Multisite network, which includes noobist.tv. For some reason, http://noobist.tv/community also points to the same forum installation (same software, database, etc.). The only difference: cookies don't carry between the domains. What are my options here? Can I enable cross-domain cookies so people stay logged in? Should I just set up a permanent redirect from noobist.tv/community > noobist.com/community? I'd sort of prefer the former, but maybe the latter is the only way.