I recently upgraded my Xcode to 4.2. Since then my Organizer-Repository stopped working. Initially it said \"Host is unreachable\" and placed red dot every where.
In
After upgrading to Xcode 4.2, I had the same problems, red dots, and "host unreachable".
I tried the recipe from majkelx, but those dots where still red.
But then I just tried to check out the repository with the Xcode organizer instead of the command line. And suddenly it all worked!
(It may not have worked without fiddling with the Keychain, like majkelx described)
EDIT: When searching for Subversion entries in keychain, also seach for "sub", not just "svn". My passwords where in "subversion". Only my web subversion password was in "svn". Just one more hint for others who are struggling with this. I wasted more than an hour on this today. :-)