Is CLIENTHOSTNAME still supported?

My group was asked to start managing some systems in our organization; we discovered that they use FQHNs as their "hostname". (No idea why)

I want them to report in to the Xymon server (4.3.12 on RHEL 6.3) with the short name instead. Strangely, on their 2 Debian Squeezy 6.0.6 systems with Xymon 4.3.0beta2, enabling CLIENTHOSTNAME works fine.

But the rest of their systems (all but one) are CentOS 5.8-5.11 and with xymon-client-4.3.17-1.el5.centos RPMs installed, enabling CLIENTHOSTNAME in "/etc/sysconfig/xymon-client" apparently has no effect. They all show up as Ghost Clients. The temp files written to "/dev/shm" are

msg.<FQHN>.txt xymon_vmstat.<FQHN>.<pid> logfetch.<FQHN>.cfg

etc. I've got CLIENTHOSTNAME set:

[root at endeavour ~]# grep ^CLIENT /etc/sysconfig/xymon-client CLIENTHOSTNAME="endeavour"

I tried manually adding "--hostname=<short name>" to the arguments and got

/usr/sbin/xymonlaunch: Unsupported argument: --hostname=endeavour

On the server side I tried adding the "CLIENT:<short name>" keyword:

[root at xymonserver xymon]# grep endeavour hosts.cfg 192.168.1.100 endeavour CLIENT:endeavour # ssh 192.168.1.100 endeavour CLIENT:endeavour # noconn

(I also tried putting it after the "#" - hey guys, a sample "hosts.cfg" file with some of the optional features/keywords wouldn't hurt, y'know.)

No difference. What am I missing?

- Greg