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
Tried everything, "Host is unreachable" all the way.
The following fixed it instantly for ME (using a https connection(!)):
Enter your repo address in Safari (only server address might work, as well).
When Safari warns you about trusting the server, "always accept" the certificate.
Restart Xcode. Done. Works.