Help resolving chronyd issues

I am having an issue resolving a chronyd issue on Rhel 7. The server should sync with a Windows 2012 R2 configured as an ntp server.

I have a Rhel 6.9 running chronyd which does this. My Rhel 7.4 running chronyd does not.

The issue is not dns, since the Rhel 7.4 resolves the name of the server. It can also tell how far off from the clock it is, so it is getting feedback from the server.

From what I have read, I don't know how the values get established in the /var/lib/chrony/drift file.

I have tried different values of makestep, to try and get chronyd to set the time at boot.

The firewall has the ntp service enabled.

I have been unable to conclusively determine if the issue is with the Rhel 7.4 or the Windows Server.

I have attached some config file extracts from the various systems.

Any help would be greatly appreciated. I've been struggling with this for a while.