http Share/Preferred Server for SoftwareDistribution

Hello, I created a http share for SoftwareDistribution this requires a Preferred Server (since it uses it credentials)

I create a simple domain account for this /landesk.distribution Shared the folder to this User with read only access:

This is the account that I use in my Preferred Server, but the authentication fails.

My http share has pass-through authentication/ enable browsing, enable windows authentication, and granted read access to local  IUSR , IIS_IUSRS and NETWORK SERVICE (landesk.distribution is also there)

The landesk.distribtion account doesn't work, if I use my admin account in the preferred Server everything works, what I'm missing?

Regards.