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Re: [ldm-users] Restoring Service after Firewall failure

On Mon, 21 May 2012, Phil Birnie wrote:


Hey Everyone,

Looking for a bit of help for our network administrators here.  Our firewall went down 
last Friday and our network admins are in the process of restoring it.  Nothing has been 
changed on our boxes (aside from a reboot once everything came back online), but we are 
still having issues getting data.   Before this outage, everything was working fine.   
We're now getting "Access denied messages" from our upstream hosts... (details 
below)

Any help is very much appreciated.


Hi Phil,

I think the firewall is blocking all incoming (at least) connections on
port 388 still. Here's an easy way to check. At a command prompt on the
LDM ingester in question using the LDM account, type this:

% ldmping idd.unidata.ucar.edu

You should see something like this:
May 22 03:46:18 INFO: State Elapsed Port Remote_Host rpc_stat May 22 03:46:18 INFO: Resolving idd.unidata.ucar.edu to 128.117.140.3 took 0.001652 seconds 
May 22 03:46:18 INFO: RESPONDING   0.061400  388   idd.unidata.ucar.edu

Now, I don't have access to idd.unl.edu, so I will use them as an example.
Look what happens when I type this from one of my LDM servers:

% ldmping idd.unl.edu
May 22 03:47:38 INFO: State Elapsed Port Remote_Host rpc_stat May 22 03:47:38 INFO: Resolving idd.unl.edu to 129.93.251.72 took 0.021817 seconds
Notice that there's no "RESPONDING" line, just a "Resolving" line. Given what you have told me, if you ldmping idd.unidata.ucar.edu and you don't get a RESPONDING line back....a firewall is blocking you. 

Gilbert

*******************************************************************************
Gilbert Sebenste                                                     ********
(My opinions only!)                                                  ******
Staff Meteorologist, Northern Illinois University                      ****
E-mail: sebenste@xxxxxxxxxxxxxxxxxxxxx                                  ***
web: http://weather.admin.niu.edu                                      **
Twitter: http://www.twitter.com/NIU_Weather                            **
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