Problems deploying Vendor Portal on Single Server (AX2012 R3)

Hi,

I am trying to deploy the vendor portal on a single server instance of Dynamics AX 2012R3, I have followed the technet articles on how to deploy the anonymous portal and did the following:

1- Created the IIS Website and Enabled Anonymous Access while disabling all the rest

2- Created the Web Application and Site Collection with anonymous access in Sharepoint 2013 Central Administration

3- The site collection uses the 2010 experience as recommended

4- Enabled guest user in AX and granted the external vendor role

The site collection navigates normally but to an empty portal:

When I click the sign in link I get the below error:

What could I be missing?

Thanks a lot