My question is similar to
Redirect subdomain to subdomain on new domain except I'm using IIS 7. The application is ASP.NET framework 2.0.
I have a url cust1.olddomain.com and I need to redirect to cust1.newdomain.com.
I need to maintain the subdomain but I need the domain to change so that the user never sees olddomain.com, and I have X number of cust subdomains.
I am able to route everything where it needs to go using DNS, but I can't figure out how to change the domain so that olddomain.com is never displayed. I was hoping to make this a 301 redirect, but from what I have read so far I don't think that's possible.
Thoughts?
Best Answer
Yea, I answered my own question!
For IIS 7 you can install the URL Rewrite Module from the MS Web Platform Installer or download it separately. Once installed, this essentially gives you the power of mod_rewrite in IIS.
To solve my redirect issue I created a new redirect entry as shown below. The URL Rewrite module provides a user interface for creating the redirect which then writes the entry to the site's web.config, like many other IIS modules.
What I am doing with this redirect is allowing all urls into the rule with the wildcard match url="*". Then I am conditionally pattern matching on the old domain. The asterisks in the conditional pattern match allow me to have back-references to whatever matches the pattern, which I then plug as {C:1} & {C:2} in the redirect action. It's the {C:1} back-reference that allows me to maintain my subdomain during the redirect and is the answer to the problem.