> On Aug 30, 2022, at 1:40 PM, Nicholas Geovanis <nickgeova...@gmail.com> wrote: > > When you run check_dns by hand on Host B, you don't say who you are logged-in > as. That can make a difference. Nagios runs its scripts in a known > environment which may be different than you expect. >
Thanks for the question. I have run the check_dns script with: - an arbitrary, unprivileged user - the nagios user (also unprivileged) - root (gasp!) They all work just fine. Also, in every case, I run tcpdump, and I can see the DNS queries and responses going back and forth just fine. In the strace messages, I can also see that the DNS messages were written and read properly. I think the issue is in nslookup, some time *after* the send/recv. But I can't narrow it down much more than that. Casey
