Azure Traffic Manager & ADFS 2012r2

Hi All

Ive installed ADFS 2012r2 (ADFS 3) on some VMs in Azure and I have Azure Traffic manager pointing to the ADFS WAP Cloud Service,

But I keep getting Degraded mode.  Traffic Manager is doing the job with no issues.  Which is great.  

I believe the issue is that TM is looking for a 200 reply from the WAP server.  The TM config is below.

relative path and file name

/adfs/ls/IdpInitiatedSignon.aspx

Port 443.

On the WAP I can brows to /adfs/ls/IdpInitiatedSignon.aspx 

Has anybody come across this issue before?

Thanks

Spud