mapping domain causing too many redirects

We're tying to map the domain to a network site.
The network site is
We've mapped several other sites without any problems, but for some reason when we map this site and try to visit the domain we get an error saying there were too many redirects.
We've verified that the A record for the domain is set up correctly, because prior to mapping the domain if you visited the domain it would go to the main network site (
We are trying to map it the same as we've done with several other sites (same exact setting). We don't know why this one is not working.