That might be because your SE's are not connected to your external network and 
they cannot directly contact your NTP server(s).  We have our HMCs getting time 
from NTP servers on our netowork (make sure 'Enable as time server'  is 
checked).   Then on the System/Sysplex ETS configuration tab enter the 
addresses of HMCs on the internal network.  This is on z114's but hopefully 
similar.
Dana


On Mon, 12 Aug 2019 17:38:11 +0000, Mark Jacobs <[email protected]> 
wrote:
>We have a couple of NTP servers in our internal network. All of them are 
>accessible from the internal network, no firewalls involved. When I'm on the 
>HMC and add one of them as an NTP server for the console to get its time from, 
>it's able to reach it. When I add the same server IP address to the 
>System/Sysplex ETS tab and test connectivity, it's going me a communications 
>failure. This is on a z13s processor.
>

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