I setup a multisite network and added couple of test sites to it. Then I added the Domain Mapping plugin and configured it accordingly.
Now, when I open my Site A and go to tools, try to map an existing domain, I keep getting the error message of "Domain name is unavailable for access". But, siteA.mysite.com URL continues to work fine.
I have a dedicated IP and have configured it too.
Please help in this setup.