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[IDD #QZH-192791]: I can't receive NIMAGE from either papagayo or idd.unidata

Hi Pete (and Clint),

> I have been unable to receive the NIMAGE feed from either my
> primary (papagayo.unl.edu) or the alternate I've been using
> for some time (idd.unidata.ucar.edu)

For some reason reverse DNS for your machine is not working:

less ~ldm/logs/ldmd.log
Apr 25 19:33:51 uni1 rpc.ldmd[12890] WARN: Couldn't resolve "" to 
a hostname in 19.9999
Apr 25 19:33:51 uni1 rpc.ldmd[12890] NOTE: Denying connection from 

% nslookup f5.aos.wisc.edu

Non-authoritative answer:
Name:   f5.aos.wisc.edu

% nslookup
;; Got SERVFAIL reply from, trying next server

** server can't find SERVFAIL

Mike Schmidt, our system administrator, told me that we have been
seeing DNS problems for your domain (aos.wisc.edu) for some time
now (approx. 3 weeks).  Can you check this out?

> [ldm@f5 ~]$ ldmping idd.unidata.ucar.edu
> Apr 25 18:59:37 INFO:      State    Elapsed Port   Remote_Host           
> rpc_stat
> Apr 25 18:59:37 INFO: Resolving idd.unidata.ucar.edu to took 
> 0.003316 seconds
> Apr 25 18:59:47 ERROR:   H_CLNTED   9.998604  388   idd.unidata.ucar.edu  
> select: RPC: Timed out
> [ldm@f5 ~]$ ldmping papagayo.unl.edu
> Apr 25 19:00:05 INFO:      State    Elapsed Port   Remote_Host           
> rpc_stat
> Apr 25 19:00:05 INFO: Resolving papagayo.unl.edu to took 
> 0.117162 seconds
> Apr 25 19:00:15 ERROR:   H_CLNTED  10.006840  388   papagayo.unl.edu  select: 
> RPC: Timed out

What is happening here is that the toplevel server process (rpc.ldmd) is off 
to do get the information for reverse lookup from a DNS server.  While it is 
it is unavailable to respond to things like 'ldmping' and new connection 
(which get queued).

> The messages I was getting in my ldmd.log were:
> Apr 25 12:16:40 f5 idd.unidata.ucar.edu[5277] ERROR: Terminating due to LDM 
> failure; nullproc_6 failure to idd.unidata.ucar.edu; RPC: Unable to receive; 
> errno = Connection reset by peer

> Any ideas? 

Yes, DNS does not appear to be working/consistent for aos.wisc.edu.

> Is there another NIMAGE feed I should be using for a backup
> other than idd.unidata.ucar.edu?


This might be a better machine for you to feed from anyway considering
that it is in the same building as you :-)


Unidata User Support                                    UCAR Unidata Program
(303) 497-8642                                                 P.O. Box 3000
address@hidden                                   Boulder, CO 80307
Unidata HomePage                       http://www.unidata.ucar.edu

Ticket Details
Ticket ID: QZH-192791
Department: Support IDD
Priority: Normal
Status: Closed

>From address@hidden  Wed Apr 26 09:14:28 2006


>I have not done anything at this end recently.  When did this problem
>start?  Are you getting any other data from us?


>From address@hidden  Wed Apr 26 09:31:30 2006


>We were having DNS issues, that was why we couldn't get data from you.
>I have a work-around going now until I can get the root problem solved.

>Data is flowing again from both you and Unidata.