Xcode 4.2 SVN issues

I am having trouble connecting my project repository to Xcode, ever since I've upgraded to 4.2. I have a local server with a forwarded port to be accessed from outside the local network. I have a DNS record pointing to the external ip. When I explicitly define the external ip (i.e https://123.456.789.000/svn/...) the repository is properly linked, no problems. This also works when I specify the internal address. The issue is when I use the repository dns - Xcode shows a red dot with "Host Unreachable". I am sure this is an Xcode 4.2 specific issue, because I tried this in other clients, including older Xcode versions. The basic problem is - the external DNS doesn't work with https.
Any ideas?

Solution

I had issues similar to yours, I suggest you try:

Close Xcode + Organiser
Open your svn web address in Safari (not any other browser) - using the dns name
It should come up saying the address is untrusted as the cert is a different name / address
Click show certificate and then tick the box saying always trust then continue
it may prompt you for your mac username / password to add to the keychain
Open xcode and try again using the DNS name..

The issue with xcode and accessing svn servers which have HTTPS certificates which fail any of the checks (be it host matching, self signed etc..). Opening the addresses in safari and adding as trusted solves this problem!