I had xF setup fine in my site's directory, but I decided to create a subdomain to that directory, so I setup the DNS, and changed the Board URL in the "Basic Board Information" admin settings. It doesn't look like there are any other settings to change, other than a few static links I had to node pages I created. But if I'm on the forum home of the sub domain, and click the "Log Out" button, I get a xF "The requested page could not be found" error, although the session is killed. The log out link looks like this: http://community.xxxxxx.yyy/logout/?_xfToken=1,1292597269,9ac74b4de4a6364ad19e6a2bae4864d11ce264ce The same problem occurs when I try to log in from the forum home page, but the authentication works ok. Logging in and logging out of the admin area appears to not be affected. I rebuilt all the cache in the forums just in case, and cleared my browser cache, but is there something else to look at? Maybe a redirect problem after authentication or the session is killed? Everything else appears to work ok with xF on a subdomain. CORRECTION: the problem only seems to happen on logging out of the forum home, I think logging in from the forum home works ok now.