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.
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I have been having the same issues, starting with beta_7 (previous betas of 4.2 did not exhibit the issue). I upgraded to the GM of 4.2, and still the same.
I discovered what was happening in my situation. The URL endpoints I've been used are SSL (https://my-svn/etc/etc). When I logged in via Safari to test, I was being presented with the "cert might not be valid" warning, then I continued past this and was able to enter my creds and could see the repository structure (as expected).
I initially thought that the cert being used on the server had expired, and Xcode was honoring the warning behind the scenes. Next time I tried with Safari, I chose the "View Certificate" in the warning, and saw that the cert was still fresh (2018 expiration date), but that our self-signed cert was not pointing to a Certificate Authority, and Safari was reporting that my Mac did not trust that cert. So, I chose the "Always trust" options that are presented by the dialog, and the warnings went away in Safari. The "forced trust" is established in the Mac's Keychain, so then I launched Xcode and viola, all of the associated repository entries in Organizer glowed green.