DNS not ok using xymon but ok using BB

I have recently installed xymon 4.2.3 on a solaris 10 platform.  I also have BB running on another solaris 10 server.  The BB server has been running for years.

My  issue:  I am monitoring seven DNS servers.   BB reports all seven as DNS OK.  However xymon reports five servers as 'not ok'.  I am unable to determine why the DNS test fails on these servers.

I have tested by changing hobbitlaunch.cfg to use:

        CMD bbtest-net --no-ares --debug --report --ping --checkresponse

I did not see any useful information from the log:

2009-08-04 15:33:30 Adding to combo msg: status <server>.dns red <!-- [flags:ordastLe] --> Tue Aug  4 15:33:07 2009 dns NOT ok
      status <server>.dns red <!-- [flags:ordastLe] --> Tue Aug  4 15:33:07 2009 dns NOT ok

Any ideas?

thanks,
Bill Wagner