Sounds like the device doesn't have a valid gateway certificate. For some reason remote control is fine without it but other functions still need it.
On that machine try running broker.config to request a certificate and try again afterwards.
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You were right the certificate was missing.
The test laptops had never been reimaged since installing a certificate when 9.0 sp3 was installed.
Do you think when I upgraded to 9.5 No sp1 that I needed to install the certificate again?
One other thing the computer in the gateway only has a red circle I thought from LD ver 9.0 I remember the icons being there.
Also the inspector works and sees the processes and services but ping and remote control do not work on it.