The redirect function in IIS 7 and 7.5 is in my experience pretty buggy. More often than not it will send the visitor into an eternal redirect loop.
Because of that I have used this simple html code for redirecting, instead of using the built in function in IIS.
Use it at your own will, I’m just posting it so I know where to find it the next time I need it :)
<html> <head> <title>Some title</title> <META HTTP-EQUIV="Refresh" CONTENT="1; URL=https://some.domain.com/"> <head> <body> You are now beeing forwarded to <a href="https://some.domain">https://some.domain></a><br> If you are not forwarded automatically, click the above link. </body></html>