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 Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated.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.
> Hi, Hi Brian, Apologies for the slow reply...busy day :) > > I seem to be having trouble establishing a feed connection. The error I'm > getting is: > > Mar 17 12:16:00 ldm idd.cise-nsf.gov[463] ERROR: Disconnecting due to LDM > failure; Couldn't connect to LDM on idd.cise-nsf.gov using either port 388 or > portmapper; : RPC: Remote system error - Connection refused nslookup indicates that your IP: 199.128.189.9 ...does not support BOTH forward and reverse resolution of the IP address. This *needs* to happen. If you cannot get your IT group to enable BOTH forward and reverse IP resolution, it will require us to hardcode your IP into our tables for "allowed" hosts. We would rather not do that, but if we cannot get forward and reverse IP resolution from your machine we can attack it on this end. Let us know how your IT group responds :) (jweber) laraine:/home/jweber 3 % nslookup 199.128.189.9 Server: laraine.unidata.ucar.edu Address: 128.117.140.62 *** laraine.unidata.ucar.edu can't find 199.128.189.9: Non-existent host/domain (jweber) laraine:/home/jweber 4 % > Is there something I need to do on my end? Yes, get forward and reverse IP/DNS resolution on your machine . . . > Thanks, > > Brian Let us know how things proceed :) Jeff Jeff Weber Unidata User Support http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: PDW-808970 Department: Support IDD Priority: Normal Status: Open