MSMQ messages using HTTP just won't get delivered #14
Another KB article has been published for MSMQ over HTTP:
The principle here is that MSMQ does a reverse lookup on the IP address to find the computer name - if the lookup fails then MSMQ isn't happy. This is similar to a previous blog where the lookup returned the wrong computer name from a HOSTS file.
I'm not sure how relevant it is to clustering and IPv6 - I suspect the problem is more generic than that - but I'll have to wait until I have some time to test it out.