I have several external servers I test with lines like this in bb-hosts:

0.0.0.0 mail.server.xxx.com # noconn smtp imaps

These are load balanced so the ip changes. I randomly get a red indication on the status page stating:

DNS lookup failed

So, in the hobbitlaunch.cfg I added --no-ares to the bbtest-net section. This seemed to fix the issue, but was curious if there was a better way. After looking at the warnings in the man page for bbtest-net I'm a little concerned. It states "You should only use this as a last resort . . ." Is there a better way to resolve this? Xymon is 4.2.3 on a RH5.3 server.