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Urgently: Mails not going out

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Urgently: Mails not going out - 30.May2005 7:04:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

Hi. I need your help!

3 servers: Domain, Exchange, ISA
Everything was fine!

Today problems begin.

Mails not going out.
Internal mailing is working.
We are receiving out mails too.
But we cannot send them.
All mails are in queue.

From exchange I cannot ping external DNS servers.
But I can ping them from ISA.
I cannot ping from any network PC.

I am pinging using external DNS ips.

local DNS gives repeating 7055 error.

exchange log shows many repeating errors like
none of the indicated DNS servers are available.

I really need your help.

Thanks a lot.

Sammy

Post #: 1

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RE: Urgently: Mails not going out - 30.May2005 7:11:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

we are using direct delivery method.

I think this is the problem with forwarders in
local DNS.

I cannot ping external DNS ips from DC too.

(in reply to HiMeSammy)

Post #: 2

RE: Urgently: Mails not going out - 30.May2005 7:14:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

on exchange:

nslookup mail.yahoo.com

DNS timeout 2 seconds

(in reply to HiMeSammy)

Post #: 3

RE: Urgently: Mails not going out - 30.May2005 7:19:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

netdiag + dcdiag
on Domain Controller shows ok

(in reply to HiMeSammy)

Post #: 4

RE: Urgently: Mails not going out - 30.May2005 7:23:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

In DNS forwarders list there are
2 external ips.

When pinging from DC -> timeout
[Frown]

(in reply to HiMeSammy)

Post #: 5

RE: Urgently: Mails not going out - 30.May2005 7:34:00 AM

maljkovik

Posts: 21
Joined: 25.May2005
From: Spain
Status: offline

Have you proved to change the forwarders in the dns server?

Prove with 194.179.1.100 like forwarder

(in reply to HiMeSammy)

Post #: 6

RE: Urgently: Mails not going out - 30.May2005 7:59:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

my forwarders are
62.212.232.1
62.212.234.131

(in reply to HiMeSammy)

Post #: 7

RE: Urgently: Mails not going out - 30.May2005 8:04:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

I was not able to ping your forwarder neither
from ISA nor from within network.

my forwarders are pinging only from ISA.
They are unreachable from within network

(in reply to HiMeSammy)

Post #: 8

RE: Urgently: Mails not going out - 30.May2005 8:57:00 AM

Tom Decaluw�

Posts: 174
Joined: 18.Sep.2003
From: Belgium
Status: offline

ping is not a good way to check if a DNS server is available! It could well be your ISA server is filtering ping and/or a firewall at you isp or whoever is blocking ICMP. It should only help you to see if name resolution is working but don't expect replies

What DNS servers are listed in your Exchange TCP/IP? (internal or external)

kan you do an nslookup of an internal and/or external address on from you exchange server

If your system is set to use internal DNS server and the internal DNS server is setup to use forwarders, can you do an nslookup from that server to the external dns server.

Use the command line

c:\>nslookup - <ip of the external dns>

this should force the client to connect to the dns server listed by ip => this way you can check if your internal DNS can actually contact the external forwarder.

Tom Decaluwe

(in reply to HiMeSammy)

Post #: 9

RE: Urgently: Mails not going out - 30.May2005 9:06:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

Exchange server:
tcp/ip: dns -> local (internal)
Exchange Server itself settings -> uses external
dns servers
(62.212.232.1
62.212.234.131)
nslookup 62.212.232.1 -> DNS request timeout

local DNS:
forwarders
(62.212.232.1
62.212.234.131) + Root hints
nslookup 62.212.232.1 -> DNS request timeout

(in reply to HiMeSammy)

Post #: 10

RE: Urgently: Mails not going out - 30.May2005 9:40:00 AM

Tom Decaluw�

Posts: 174
Joined: 18.Sep.2003
From: Belgium
Status: offline

Is the internal DNS on the exchange server?

try doing a telnet from your internal DNS server that is forwarding to the external DNS server on port 53

c:\>telnet <ip external DNS> 53

this should give you a black screen indicating the system connected.

If this is not working check 2 things:

1) Is your gateway still set correctly and is your routing still going ok?

2) FIRST check the ISA server if it's not blockign you !

Tom

(in reply to HiMeSammy)

Post #: 11

RE: Urgently: Mails not going out - 30.May2005 9:45:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

yes telnet gave me black screen

it is ok.

internal dns is not on exchange.

(3 server ISA, Exchange, DC)
DNS on DC

(in reply to HiMeSammy)

Post #: 12

RE: Urgently: Mails not going out - 30.May2005 9:51:00 AM

Tom Decaluw�

Posts: 174
Joined: 18.Sep.2003
From: Belgium
Status: offline

and if you telnet from your exchange server to the internal internal DNS server on port 53

(in reply to HiMeSammy)

Post #: 13

RE: Urgently: Mails not going out - 30.May2005 9:53:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

from exchange it fails [Frown]

(in reply to HiMeSammy)

Post #: 14

RE: Urgently: Mails not going out - 30.May2005 9:55:00 AM

HiMeSammy

Posts: 49
Joined: 26.May2005
From: Azerbaijan
Status: offline

sorry, i've mistaken.

local dns is being 'telnetted'

it's ok

(in reply to HiMeSammy)

Post #: 15

RE: Urgently: Mails not going out - 30.May2005 12:50:00 PM

ChadAntonio

Posts: 65
Joined: 29.Jul.2002
From: Philippines
Status: offline

can u browse web sites from your exchange server?

if not, may be you have a routing restriction from your isa server.

have you configured an outbound firewall policy from your exchange server to the external network? you know... outbound policy is from <exchange ip> to <external network>

[ May 30, 2005, 12:53 PM: Message edited by: Nexus ]

(in reply to HiMeSammy)

Post #: 16

RE: Urgently: Mails not going out - 1.Jun.2005 5:07:00 AM

Yba

Posts: 14
Joined: 1.Jun.2005
From: SA
Status: offline

Hi There,
When I started reading your post, I started telling myself "hmmm, this is not my way of writing, it is a bit odd." The situation was so identical that I forot to glance the name of the poster.
Dear friend,
I got excatly the same scenario, genetically identical, and to cheer you up, it is solved.
Before I give you the solution, I would like to remind all the readers of the importance of these boards where we can all share our valuable experiences so to solve pesronal as well as corporate problems; may the whole world one day unite.
Here is the cure:
This is an ISA issue. BTY, I have placed a post some days back on ISAserver.org boards but had to go the hard way of doing it myself.
In ISA 2004, if you block any user by:
1 - A specail deny "group_of_users" rule,
2 - A special allow "group_of_users" rule, or
3 - Allow all rule with exclusions,
then outgoing mail will not work. The system will keep telling you that you can it can not find any of the specified DNS servers. And, yes, ping rule, in this scenario, can be allowed through ISA rules but will not solve the issue.
So, remove any custom created user groups from your access rules and in the Allow all rule, use only All Users built-in user group with no exclusions.
Well, after all, I hope that this "genetic" equality works on the positive side too.
Regards
Yba.

P. S. Guys, keep on posting and if someone could report this problem to Microsoft or check for reasons or hotfixs, it would be just great.

(in reply to HiMeSammy)

Post #: 17

RE: Urgently: Mails not going out - 2.Jun.2005 4:45:00 AM