[LDM #CGE-685224]: Texas Tech connection to idd

Bruce,

The wireshark dump has this:

      1 2017-12-15 10:39:16.563050    128.117.140.3         129.118.157.89      
  TCP      78     388→32884 [SYN, ACK] Seq=0 Ack=1 Win=14480 Len=0 MSS=1460 
SACK_PERM=1 TSval=2685230929 TSecr=4959212 WS=256
      2 2017-12-15 10:39:16.611079    128.117.140.3         129.118.157.89      
  TCP      70     388→32884 [ACK] Seq=1 Ack=125 Win=14592 Len=0 
TSval=2685230978 TSecr=4959260
      3 2017-12-15 10:39:17.436585    128.117.140.3         129.118.157.89      
  TCP      94     388→32884 [PSH, ACK] Seq=1 Ack=125 Win=14592 Len=24 
TSval=2685231803 TSecr=4959260
      4 2017-12-15 10:39:17.436620    128.117.140.3         129.118.157.89      
  TCP      70     388→32884 [RST, ACK] Seq=25 Ack=125 Win=14592 Len=0 
TSval=2685231803 TSecr=4959260
      5 2017-12-15 10:39:18.207817    128.117.140.3         129.118.157.89      
  TCP      58     388→32884 [RST] Seq=25 Win=0 Len=0

A reset (RST) packet from 128.117.140.3 would definitely cause the connection 
to close.

I tried a reverse DNS lookup on 129.118.157.89 and got nothing. That's the 
problem. Our LDM server is trying to convert the IP address associated with the 
incoming connection into a fully-qualified hostname to match against the ALLOW 
entries the LDM configuration-file. The conversion can't be done because your 
system doesn't have a DNS entry.

Tell your network administrator to add a DNS entry for your LDM host's IP 
address. Once that's done, things should work.

> Perhaps this will help?  Attached are two wireshark reports... one of which
> is in plain text if necessary  Also included is a portion of the log file
> when the connection went down.  ldmping still reports no access to
> idd.unidata.ucar.edu.
> 
> 20171213T071035.923494Z idd.unidata.ucar.edu[25663] NOTE
> svc_tcp.c:358:readtcp() EOF on socket 5
> 20171213T071035.923507Z idd.unidata.ucar.edu[25663] NOTE
> one_svc_run.c:95:one_svc_run() one_svc_run(): RPC layer closed connection
> 20171213T071035.923512Z idd.unidata.ucar.edu[25663] NOTE
> ldm_config_file.c:841:requester_exec() Log messages flushed
> 20171213T071035.923520Z idd.unidata.ucar.edu[25663] NOTE
> error.c:236:err_log() Connection to upstream LDM closed: pid=28607
> 20171213T071036.273487Z idd.unidata.ucar.edu[25664] NOTE
> svc_tcp.c:358:readtcp() EOF on socket 6
> 20171213T071036.273502Z idd.unidata.ucar.edu[25664] NOTE
> one_svc_run.c:95:one_svc_run() one_svc_run(): RPC layer closed connection
> 20171213T071036.273507Z idd.unidata.ucar.edu[25664] NOTE
> ldm_config_file.c:841:requester_exec() Log messages flushed
> 20171213T071036.273515Z idd.unidata.ucar.edu[25664] NOTE
> error.c:236:err_log() Connection to upstream LDM closed: pid=28603
> 20171213T071036.635618Z idd.unidata.ucar.edu[25662] NOTE
> svc_tcp.c:358:readtcp() EOF on socket 5
> 20171213T071036.635636Z idd.unidata.ucar.edu[25662] NOTE
> one_svc_run.c:95:one_svc_run() one_svc_run(): RPC layer closed connection
> 20171213T071036.635645Z idd.unidata.ucar.edu[25662] NOTE
> ldm_config_file.c:841:requester_exec() Log messages flushed
> 20171213T071036.635654Z idd.unidata.ucar.edu[25662] NOTE
> error.c:236:err_log() Connection to upstream LDM closed: pid=28602

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: CGE-685224
Department: Support LDM
Priority: Normal
Status: Closed
===================
NOTE: All email exchanges with Unidata User Support are recorded in the Unidata 
inquiry tracking system and then made publicly available through the web.  If 
you do not want to have your interactions made available in this way, you must 
let us know in each email you send to us.