[LDM #JVG-389825]: ldm: can't contact portmapper

John,

> I recently installed ldm-6.10.1 on a box running CentOS 6.2. When I
> start ldm, I get the following errors:

The relevant log messages are

> May 15 17:05:16 caic0 ldm.madis-data.nws.noaa.gov[5830] NOTE: Starting 
> Up(6.10.1): ldm.madis-data.nws.noaa.gov:388 20120515220516.969 TS_ENDT 
> {{FSL2,  ^FSL.CompressedNetCDF.MADIS.(metar|sao|mesonet2|hydro2|snow)"}}
> May 15 17:05:16 caic0 ldm.madis-data.nws.noaa.gov[5830] NOTE: Previous 
> product-information file ".8811ad68602339cf39acbeef481ae754.info" doesn't 
> exist
> May 15 17:05:16 caic0 ldm.madis-data.nws.noaa.gov[5830] NOTE: LDM-6 desired 
> product-class: 20120515220516.970 TS_ENDT {{FSL2, 
> "^FSL.CompressedNetCDF.MADIS.metar|sao|mesonet2|hydro2|snow)"}}
> May 15 17:05:17 caic0 ldm.madis-data.nws.noaa.gov[5830] ERROR: Disconnecting 
> due to LDM failure; nullproc_6 failure to ldm.madis-data.nws.noaa.gov; RPC: 
> Unable to receive; errno = Connection reset by peer
> May 15 17:05:17 caic0 ldm.madis-data.nws.noaa.gov[5830] NOTE: LDM-6 desired 
> product-class: 201205152205 17.111 TS_ENDT {{FSL2, 
> "^FSL.CompressedNetCDF.MADIS.(metar|sao|mesonet2|hydro2|snow)"}}

These messages indicate that the downstream LDM process on host "caic0" 
couldn't connect to the upstream LDM server on host 
"ldm.madis-data.nws.noaa.gov". This is consistent with your ldmping(1) results:

> Snow 202% ldmping -vl- -h fcst.mtnweather.info
> May 15 23:30:54 INFO:      State    Elapsed Port   Remote_Host
> rpc_stat
> May 15 23:30:54 INFO: Resolving fcst.mtnweather.info to 67.174.122.3
> took 0.049939 seconds
> May 15 23:30:55 ERROR:  ADDRESSED   0.262519    0
> fcst.mtnweather.info  RPC: Unable to receive; errno = Connection reset
> by peer
> May 15 23:31:30 ERROR:      NAMED  10.000169    0
> fcst.mtnweather.info  can't contact portmapper: RPC: Timed out

A downstream LDM will try using the portmapper on the upstream LDM host if and 
only if the downstream LDM can't connect directly with the upstream LDM server 
using port 388; consequently, the "portmapper" error-message is a red herring.

It appears that port 388 on host "ldm.madis-data.nws.noaa.gov" cannot be 
accessed by host "caic0". ldmping(1) is a better test than your nc(1) command, 
in this regard, because it actually sends and receives data.

I suggest you consult with your network administrator to resolve the port 388 
issue.

> The ldm machine is running on a LAN, so I forwarded port 388 in the
> router to this machine (caic0). Are there other ports that need to be
> forwarded?
> 
> I turned off the firewalls in both the router and the ldm machine, but
> that did not work either.
> 
> Some other potentially useful information:
> 
> [root@caic0 etc]# rpcinfo -p
> program vers proto   port  service
> 100000    4   tcp    111  portmapper
> 100000    3   tcp    111  portmapper
> 100000    2   tcp    111  portmapper
> 100000    4   udp    111  portmapper
> 100000    3   udp    111  portmapper
> 100000    2   udp    111  portmapper
> 100024    1   udp  59270  status
> 100024    1   tcp  34968  status
> 300029    6   tcp    388  ldmd
> 300029    5   tcp    388  ldmd
> 
> From a machine outside the LAN:
> 
> Snow 218% nc -v -z fcst.mtnweather.info 388
> Connection to fcst.mtnweather.info 388 port [tcp/sunrpc] succeeded!
> 

> 
> Any thoughts on where to go from here?
> 
> Thanks,
> John Snook


Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: JVG-389825
Department: Support LDM
Priority: Normal
Status: Closed