Checking the documentation of this issue, I tested the connection on port 59000 from a PC to the UCCX, both on the same subnet and it refuses connection. On port 80 it opens normally and the traffic doesn't pass through any firewall.
Between agent and supervisor I can open connection on 59020 and 59021.
I don't have a UCCX 9.x system at this moment, but what I can see in the Port Usage Guide, port 59000 is not mentioned, so either the documentation is missing something, or it's UCCX's expected behaviour.
Can you take a look at the logs on the client PC where CSD is installed?
Yesterday I found out the cause of this issue. Our UCCX is in a datacenter and the traffic from CSD to UCCX was misguided going through a VPN link, whereas in the opposite way the traffic came via MPLS.
After fixing this behaviour, routing only through MPLS, CSD/CAD started working properly.
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...