Public BGP Peering not coming up

Hi,
I have the Private peering up and running on the Expressroute, but struggling with the Public peering.

I have configured the Public IP addressed subnets and public ASN. I can ping the MS side of the subnet ok, but BGP will not come up. Also, I cannot telnet to TCP179 from my router...

Is there anywhere I can look to get more diagnostic info on the MS side and find out why this is not coming up?

Thanks,

Peter