So you may find yourself having issues calling into the development fabric web roles. The error message will be something like ‘te server actively refused the connection’. There are some issues with IPv6. The development fabric will only listen on open host and I think what was happening is that the requests appear to be coming from the IPv6 address rather than the IPv4 one3.

Anyway, I disabled IPv6 and commented the IPv6 localhost entry from the *.hosts file. All worked after this.