I followed this link to configure IFD.
However my auth and dev FederationMetadata.xml page not found.
Their example works:
auth.interactivewebs.com/.../FederationMetadata.xml
I checked my DNS configured correctly and both pingnable.
my sts FederationMetadata.xml works. The internal claims-based access is working.
The only thing is that I did not use a different internal crm as they did.
Then when configured for IFD, external auth/dev metadata xml return page not available.