Kimmyaf,
Yes, the Coming Soon plugin is most likely taking priority over the redirect because it redirects all pages to its Coming soon message except the login page. However, if you are trying to use the plugin to redirect the entire site to another URL, it really will not work as you expect. That is because the plugin is only meant to redirect one page or post at a time, not the entire site. So if you use ‘/’ as the request, it will redirect the home page (at the root) but anything else (i.e., ‘/contact/’, or ‘/something/else/’, or ‘/?p=13’) would not get redirected because they are completely different pages/posts as far as WordPress and the plugin are concerned.
If you want the entire URL/Site to go to a new domain, the BEST way to do it is at the Registrar (the place you registered the domain name). They usually have 2 options for a domain: one to Host the domain (by setting NameServers for the host server), and a second to Forward the domain to a different URL. You would pick the latter and put the domain/URL of the new site. You do not need masking or anything, just a plain old forward. Then it usually take a few minutes to a few hours (depending on your registrar) and the site will then forward, no matter what page they try to go to.
If you are trying to do something different, let me know and I will try to help you though it.
Warm regards,
Don
