CTS+ and user Guest in Windows Server

Hi Everyone

I have already configured the CTS+ from my SOLMAN to 3 CE systems. All transports are passed correctly between systems, but only when the windows GUEST user is unlocked

When the Windows GUEST user is locked, the transport send the following error:

I read that for security reasons the windows guest user locks in automatic, because of this, before passing an order we need to unlock first the guest user and then pass the order.

What is wrong configured? can I use the windows service user instead Guest user ?

Best Regards