I just found the culprit: No default gateway was configured on my DHCP server, i have added a valid IP and now everything working great, even without any internet connection.
Now, why 1903 need that one and not lower version ....
I am working in a test environment with VMWARE
Windows Server Update Services (WSUS) is needed for software updates synchronization and for the software updates applicability scan on clients. The WSUS server must be installed before you create the software update point role. The following versions of WSUS are supported for a software update point:
source > https://docs.microsoft.com/en-us/sccm/sum/plan-design/prerequisites-for-software-updates
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