notifyme is another valuable tool for seeing if you're getting connection
errors and trying to characterize. However, I suspect Daryl is on to
something regarding a firewall issue.
gerry
On Tue, Jan 19, 2021 at 4:55 PM Evan Breznyik <evan@xxxxxxxxxxxx> wrote:
> I agree but will add: we see problems with ldmping even when there is no
> firewall and our servers are actively connected, so YMMV.
>
> My fallback is to netcat or telnet to the LDM port (388) to test. With
> ldmping, it rarely works as described for me. Of the 15 or so servers we
> connect to, I can only ldmping one of them, and of those 15 I run 4 of them
> and fully control the network plane which is wide open, so...I would try
> the netcat or telnet trick...or, if possible, ping or traceroute to the
> IP/host from LDM user or with sudo powers as well. That can rule in or out
> network/firewall issues...or it can also tell you (like I often
> experience): "the connection works fine but ldmping is confused for some
> other reason".
>
> On Tue, Jan 19, 2021 at 9:26 AM Herzmann, Daryl E [AGRON] <
> akrherz@xxxxxxxxxxx> wrote:
>
>> Hi Robert,
>>
>> This certainly looks like a firewall/routing issue. Some things I would
>> suggest checking.
>>
>> 1) Is there a routable network path between the LDM client and server and
>> back to the client? Perhaps these devices are behind NATs which have their
>> own firewalls? Are you able to connect from the client to the server on
>> other ports, like SSH, HTTP, etc?
>>
>> 2) On the server, double check your firewall settings. If you can,
>> temporally drop the server firewall and see if the LDM client can ping.
>> Ensure that you don't have both iptables and firewalld running at the same
>> time.
>>
>> 3) Can any other LDM client connect to this server?
>>
>> 4) On the client, ensure the server's FQDN doesn't exist in /etc/hosts
>> with a different IP as you mentioned DNS already has it.
>>
>> daryl
>>
>> --
>> /**
>> * daryl herzmann
>> * Systems Analyst III -- Iowa Environmental Mesonet
>> * https://mesonet.agron.iastate.edu
>> */
>>
>> ________________________________________
>> From: ldm-users <ldm-users-bounces@xxxxxxxxxxxxxxxx> on behalf of
>> Mullenax, Robert R. (WFF-820.0)[ORBITAL SCIENCES CORPORATION] via
>> ldm-users <ldm-users@xxxxxxxxxxxxxxxx>
>> Sent: Tuesday, January 19, 2021 11:14 AM
>> To: ldm-users
>> Subject: [ldm-users] Strange LDM connectivity issue
>>
>> Good morning,
>>
>> I rarely have LDM connectivity issues, but am having a weird one this
>> morning. I have two systems, at our facilities in different states that I
>> manage. Our NOAAport ingest machine is down at one location, so I want to
>> feed from the LDM server at the other location that is being fed by another
>> dish/NOAAport ingest machine. I have proper allows/request on both ends,
>> DNS resolves correctly, SELinux (CENTOS 7) is disabled on both machines,
>> and port 388 is allowed through firewall. Each machine is getting a
>> non-NOAAPort data feed from another out-of-state LDM just fine.
>>
>> Ldmping results in:
>>
>> 20210119T171056.791467Z ldmping[11619] ERROR ldmping.c:75:print_hstat()
>> SVC_UNAVAIL 10.097094 0 XXXXXXXXXXXX.com
>> h_clnt_create(XXXXXXXXXXXXX.com): Timed out while creating connection
>>
>> Yet the server on the other end is running and all is nominal.
>>
>> Any ideas on what to check?
>>
>> Thanks,
>> Robert Mullenax
>>
>> Robert Mullenax
>> Staff Meteorologist
>> CSBF/Northrop Grumman
>> Palestine, Texas
>> 903-729-0271
>>
>> _______________________________________________
>> NOTE: All exchanges posted to Unidata maintained email lists are
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>>
>>
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> _______________________________________________
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--
Gerry Creager
NSSL/CIMMS
(C) 979.229.5301 <--- NOTE THAT MY OFFICE NUMBER HAS CHANGED
++++++++++++++++++++++
*The way to get started is to quit talking and begin doing.*
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