Mailing List CGatePro@mail.stalker.com Message #101637
From: Brian Gibson <gibson_brian@wheatoncollege.edu>
Subject: Re: help with DNS issue
Date: Mon, 21 Feb 2011 10:16:08 -0500
To: CommuniGate Pro Discussions <CGatePro@mail.stalker.com>
Very odd, I went to the domain controller's cached lookups folder and I removed the .dk folder and then lookups worked fine and the mail could be delivered. Could it be that at one point it received a negative request for the first time it tried to look something up in that domain and it held onto it?



On 2/21/2011 10:05 AM, Brian Gibson wrote:
This might sound odd but there is another message in the queue to another Danish site and it hasn't reported the DNS lookup issue (yet) but when I query its domain name against our 2 DNS servers I am getting the same problem, one can query it, the other cannot.... Here is an example. Is there such a think as DNS servers ending up on RBL lists?


C:\>nslookup leifstark.dk 155.47.64.174
Server:  wcdc.wheatonma.edu
Address:  155.47.64.174

*** wcdc.wheatonma.edu can't find leifstark.dk: Server failed

C:\>nslookup leifstark.dk 155.47.105.40
Server:  wcdclib.wheatonma.edu
Address:  155.47.105.40

Non-authoritative answer:
Name:    leifstark.dk
Address:  195.249.40.49





On 2/21/2011 9:49 AM, Lyle Giese wrote:
Brian Gibson wrote:
Hi all,

We are having an issue sending a message because of DNS and I am kind of baffled as to why. A message in the queue is destined for the domain dis.dk but I am getting the following message in the queue

Failed to deliver to 'amo@dis.dk'
SMTP module(domain dis.dk) reports:
 dis.dk: DNS server failure

The /etc/resov.conf on the CGPro server looks like this

search wheatonma.edu
nameserver 155.47.64.174
nameserver 155.47.105.40


The 2 DNS servers are our Windows domain controllers. If I query dis.dk against the first I get nothing, if I query dis.dk against the second it does resolve (see dig results below). Any ideas on how to troubleshoot whether this is something wrong with our DNS server or something happening higher up with the recursive queries?


[root@xmail ~]# dig dis.dk @155.47.64.174

; <<>> DiG 9.2.4 <<>> dis.dk @155.47.64.174
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 42008
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dis.dk.                                IN      A

;; Query time: 0 msec
;; SERVER: 155.47.64.174#53(155.47.64.174)
;; WHEN: Mon Feb 21 09:16:40 2011
;; MSG SIZE  rcvd: 24

[root@xmail ~]# dig dis.dk @155.47.105.40

; <<>> DiG 9.2.4 <<>> dis.dk @155.47.105.40
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44900
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dis.dk.                                IN      A

;; ANSWER SECTION:
dis.dk.                 689     IN      A       74.53.248.36

;; Query time: 0 msec
;; SERVER: 155.47.105.40#53(155.47.105.40)
;; WHEN: Mon Feb 21 09:16:52 2011
;; MSG SIZE  rcvd: 40

I would do a dig +trace mail-gw.dis.dk from the server having problems resolving this.

Lyle Giese
LCR Computer Services, Inc.


-- 



++++++++++++++++++++++++++++
Brian Gibson
Systems Administrator
Wheaton College

Are you a musician? If so visit my Arbans Online music site at http://arbansonline.com and listen & contribute

-- 



++++++++++++++++++++++++++++
Brian Gibson
Systems Administrator
Wheaton College

Are you a musician? If so visit my Arbans Online music site at http://arbansonline.com and listen & contribute
Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster