[ale] Can't connect to port 53

Jim Lynch ale_nospam at fayettedigital.com
Fri Jan 18 09:28:30 EST 2013


On 01/18/2013 08:47 AM, Lightner, Jeff wrote:
> What thread are you responding to here?  I don't see any others in the thread yet I see other messages from Ale.
My own.  I got my message in addition to the others in the thread.
>
> I agree that verifying basic connectivity using telnet command is a valid troubleshooting step.
> telnet <DNS host> 53
> If that doesn't work nothing else is likely to succeed.
>
> Use of "nslookup" is deprecated for basic resolution - one should use "host" instead.
I know, but I'm very old school and since it's there and works and I 
know how it works, I use it.
>
> Using dig is better than nslookup for DNS troubleshooting.
> dig @<DNS host> <options/target domain>
Thanks, I never knew how to specify a dns host on dig before, but then 
since I knew how to run nslookup, I didn't have to. ;-)
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> -----Original Message-----
> From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of Jim Lynch
> Sent: Thursday, January 17, 2013 6:11 PM
> To: Atlanta Linux Enthusiasts
> Subject: Re: [ale] Can't connect to port 53
>
> On 01/17/2013 06:01 PM, gcs8 wrote:
>> Why are you using the DNS port?
>>
> I was attempting to test the dns configuration via nslookup and it couldn't connect to the dns server.  I was doing elementary troubleshooting which involves checking to see if the port was open and the easiest way to test that is via telnet, as far as I know.
>
> Jim.
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