I've seen a similar issue, but it was narrowed down to just a few agents and the problem was exactly how you described. The solution was a reinstall of the CAD on the agents machine and it corrected the problem for me.
This is a fairly common issue from reading the forums. Make sure that the CAD agent isn't on the desktop image, if using one. Also, make sure of the following:
Perform the following tests:
From server to agent: telnet 59020
From server to supervisor: telnet 59021
From agent to server: telnet 59000
From supervisor to server: telnet 59000
None of those connections should fail. If they do you will need to correct that issue.
Ensure also the following:
Windows Firewall (or any other firewall) isn't blocking anything
I had a similiar issue with username in uppercase while their logon was in lowercase....which amazingly was causing this issue. A directory syncronization led me to that issue as the sync was erroring out on that particuliar user for me.
Oh...and make sure the supervisor agent and CAD agent are same versions...
I have a variation of this issue on UCCX 7.0(1)SR4. What I am getting is agent.exe is "dying" and a new one starts (i.e. can see two or more agent.exe's in Windows Task Manager and running netstat -a in a command window shows the ports (sockets as they are sometimes called) in CLOSE_WAIT. See bug CSCtd07195 (which is for UCCE 7.5). It is with the CAD developers
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