[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

20030911: Two LDM's not talking to each other

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: 20030911: Two LDM's not talking to each other
  • Date: Thu, 11 Sep 2003 10:47:58 -0600
Alan,

> To: address@hidden
> From: "Alan Hall" <address@hidden>
> Subject: Two LDM's not talking to each other
> Organization: NOAA
> Keywords: LDM

The above message contained the following:

> reflect is tryin to feed doppler feedtype WSI data:
> 
> Sep 11 15:39:52 reflect doppler(feed)[26833]: up6.c:299: Starting 
> Up(6.0.13/6):
> 20030911135338.796 TS_ENDT {{WSI,  ".*"}}
> Sep 11 15:39:52 reflect doppler(feed)[26833]: topo:  doppler.ncdc.noaa.gov WSI
> Sep 11 15:39:52 reflect doppler(feed)[26833]: up6.c:168: HEREIS: RPC: Unable 
> to
> send; errno = Broken pipe
> Sep 11 15:39:52 reflect doppler(feed)[26833]: up6.c:369: Product send failure:
> Input/output error
> Sep 11 15:39:58 reflect rpc.ldmd[19596]: child 26833 exited with status 6
> 
> Doppler is trying to receive the WSI data from reflect:
> 
> Sep 11 15:40:53 doppler 205.167.25.177[66566]: Desired product class:
> 20030911135338.796 TS_ENDT {{WSI,  ".*"}}
> Sep 11 15:40:53 doppler 205.167.25.177[66566]: Connected to upstream LDM-6
> Sep 11 15:40:53 doppler 205.167.25.177[66566]: Upstream LDM is willing to feed
> Sep 11 15:40:53 doppler 205.167.25.177[66566]: ERROR: requester6.c:178:
> Connection to upstream LDM closed
> 
> 
> These two machines have been working together for years.  Any suggestions?

The above error messages indicate that the connection between Doppler
and Reflect was broken by an outside force rather than by the LDMs
themselves at the point where the client/server relationship was turned
around (initially, Doppler is the client and Reflect the server; this
relationship is reversed in order to send data).  I suspect a firewall
issue whereby packets from Doppler to Reflect are allowed to pass but
that packets from Reflect to Doppler are not.  This hypothesis is also
consistent with your observation that they used to work together until
just recently.

Support for this hypothesis might be obtained by executing client
software on Reflect that connects to server software on Doppler (e.g.,
try to ssh(1) or telnet into Doppler from Reflect).

Please let me know what you discover.

Regards,
Steve Emmerson
LDM Developer