On the application server (windows 2008 r2) we have our site (XYZ) hosted in IIS. Our site XYZ uses port 80 and 443. We had removed Default Web Site from IIS since we didnt need it. Now we want to use MSMQ with Internet Messaging.
I Googled and found that MSMQ setup is designed in such a way that "MSMQ" virtual directory will always be created under default web site. So I added Default Web Site manually and set hostname for it (without hostname it wouldn't start as XYZ also uses port 80) and did IIS reset. Then enabled MSMQ HTTP feature, however, "MSMQ" virtual directory still gets created under our site XYZ.
Note: XYZ was created before enabling MSMQ HTTP support. I am not sure if the sequence matters!
Looks like setting host-name for default web site did a mess. I removed host-name and set site (default) to work on port 8080. Then referred it like http://server:8080/MSMQ and internet explorer returned HTTP 501 error which is what I wanted. Tried posting actual message too and yes it worked.