We had a similar issue we reported to our Wyse contact. He provided me with an rpm named “dhclient_hostname-1-0.sletc11sp1.rpm” that we had to drop in the addons folder, as well as create a file called “directory” that within it just had 1 line, “dhclient_hostname-1-0.sletc11sp1.rpm” (no quotes). Then, within our wlx.ini file, we had to enter, again without quotes “NewAddons=dhclient_hostname-1-0.sletc11sp1.rpm”.
I’d attach the RPM here but doesn’t look like this forum supports file attachments.