//quit $ZU(67,12,$j)
set process=##CLASS(%SYS.ProcessQuery).Open($j)

quit process.ClientNodeName
 

I made same mistake in my original post when I used $ZU(110), just like yours and another comments on this post, we will all get the hostname of the Cache server, not the workstation name of the xDBC connection comes from. My customer was specifically looking for the workstation name establishes the connection, not the host where Cache runs.