connection dropped due to an smtp protocol event sink : smtp, protocol, event, dropped, connection

May 9, 2008 06:38pm pdt

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08.27.2004 at 10:58AM PDT, ID: 21110083

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6.4

connection dropped due to an smtp protocol event sink

Zone: Exchange Email Server

Tags: smtp, protocol, event, dropped, connection

yesterday we started having problems with outgoing mail being stuck in the queue. the only message i get is "the connection was dropped due to an SMTP protocol sink". I've got 835 messages waiting to go out.

i tried everything that was recommended on this page:

http://forums.msexchange.org/ultimatebb.cgi?ubb=get_topic;f=18;t=000384

but none of it seems to help the queue problem.

additionally i find this event disturbing:

Event Type:      Warning
Event Source:      smtpsvc
Event Category:      None
Event ID:      2012
Date:            8/27/2004
Time:            12:56:29 PM
User:            N/A
Computer:      JUPITER
Description:
SMTP could not connect to the DNS server 'xx.xxx.xx.xxx'. The protocol used was 'UDP'. It may be down or inaccessible.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: d5 04 00 00 ...

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Question Stats

Zone: Networking

Question Asked By: michaeltegler

Solution Provided By: Yan_west

Participating Experts: 4

Solution Grade: B

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08.27.2004 at 11:25AM PDT, ID: 11916124

Rank: Master

Yan_west:

When you are investigating possible DNS issues, I would suggest you download the DNSDiag.exe tool on
http://www.microsoft.com/downloads/details.aspx?FamilyID=E0F616C6-8FA4-4768-A3ED-CC09AEF7B60A&displaylang=en.
Its called DNS Resolver Tool. You can test out resolution to domains using a
syntax like dnsdiag mail.foo.com -d -v 1, and it will show you the query to
the DNS server as batched by Exchange in verbose mode and possible errors.

Accepted Solution

08.27.2004 at 11:25AM PDT, ID: 11916137

Rank: Master

Yan_west:

Hmm are you running windows 2003 btw? it only works in 2003..

08.27.2004 at 11:46AM PDT, ID: 11916324

Rank: Savant

Sembee:

It looks like a straight DNS error.
How have you got DNS configured for that machine? Have you over ridden the server DNS and entered different DNS settings in Exchange itself?

Simon.

Assisted Solution

08.27.2004 at 01:08PM PDT, ID: 11917179

michaeltegler:

am running windows 2k3, ran the dnsdiag as suggested:

C:\WINDOWS\system32\inetsrv>dnsdiag mail.xxxx.com -d -v 1
Running in debug/verbose mode.
The DNS flags are not explicitly set in the metabase, assuming default flags - 0
x00000000
These are the local IP addresses (server-bindings)
xx.xxx.xx.2
Microsoft Exchange is installed on this machine.
Querying domain controller for configuration.
The domain controller server which will be used for reading configuration data i
s jupiter.xxxx.com
Connecting to jupiter.xxxx.com over port 389
configurationNamingContext is "CN=Configuration,DC=xxxx,DC=com"
This will be used as the Base DN for all directory searches.
Checking if the target server mail.xxxx.com is an Exchange server
Searching for an Exchange Server object for mail.xxxx.com on the domain
controller
No Exchange Server object found for mail.xxxx.com on domain controller,
mail.xxxx.com is an external server (not in the Exchange Org).
Checking on DC if the VSI being simulated is configured with external DNS server
s.
Searching for an Exchange Server object for jupiter.xxxx.com on the doma
in controller
LDAP search returned some results, examining them.
Examining next object for attributes we are interested in.
Successfully read the distinguishedName attribute on the Exchange Server object.
The value of the attribute is CN=JUPITER,CN=Servers,CN=PRODUCTION,CN=Administra
tive Groups,CN=GSP,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=gspmark
eting,DC=com
The search returned the following 6 values for the networkName attribute for the
Exchange Server object for jupiter.xxxx.com
Attempting to match the TCP/IP networkName of the Exchange Server object returne
d from the domain controller against the FQDN we are searching for
0> networkName: ncacn_vns_spp:JUPITER...match failed
1> networkName: netbios:JUPITER...match failed

if there is a glaring problem there i can't see it. i have tried both external and internal dns servers. the outgoing mail still doesn't work.

08.27.2004 at 06:12PM PDT, ID: 11918822

Rank: Wizard

BNettles73:

Were any changes made to the firewall or router recently?
Have you tested DNS with NSLOOKUP? http://support.microsoft.com/default.aspx?scid=kb;EN-US;200525
Have you tested SMTP with telnet? http://msexchange.org/tutorials/Telnet-Exchange2003-POP3-SMTP-Troubleshooting.html
Do you have multiple NIC's in the machine ... have you checked the hardware lately?
If you use Queue Viewer, and click on the queue where the messages are stuck does it provide any other information?

I'd try turning up logging on MSExchangeTransport and see what other errors are generated.

Is the Exchange server also a DNS server? Are you using Root Hints, forwarding queries to another server, using an internal caching server?

Like most of the others stated ... I agree, DNS is most likely the culprit ...

Assisted Solution

08.28.2004 at 03:10PM PDT, ID: 11923431

michaeltegler:

i've re-installed the internet dns servers. there was a problem there. one of the server somehow got corrupted. the exhange server is not a dns server. the dns servers are very standard.

i've since tested dns with nslookup. it seems fine.

but now i'm getting this error:

Event Type:      Error
Event Source:      smtpsvc
Event Category:      None
Event ID:      2013
Date:            8/28/2004
Time:            4:58:48 PM
User:            N/A
Computer:      JUPITER
Description:
SMTP could not connect to any DNS server. Either none are configured, or all are down.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 7c 26 00 00 |&..

both network cards are working perfectly. i can browse the network and internet with either unplugged.

i have the MSExchangeTransport logging. all i'm getting is a lot of this:

Event Type:      Information
Event Source:      MSExchangeTransport
Event Category:      SMTP Protocol
Event ID:      7512
Date:            8/28/2004
Time:            5:04:55 PM
User:            N/A
Computer:      JUPITER
Description:
The message with ID <200408282127.OAA89807@mail.wppcheif.com>, P1 From smtp:Sweepsgame@mail.wppcheif.com, Subject Refinance with Christian Lending Principles , from remote host "JUPITER" was Rejected/Deleted by Intelligent Message Filter. This is an informational event and does not indicate an error.

For more information, click http://www.microsoft.com/contentredirect.asp.

08.28.2004 at 03:22PM PDT, ID: 11923466

michaeltegler:

also i get this error when i set an outside dns server

Event Type:      Warning
Event Source:      smtpsvc
Event Category:      None
Event ID:      2012
Date:            8/28/2004
Time:            5:17:09 PM
User:            N/A
Computer:      JUPITER
Description:
SMTP could not connect to the DNS server '65.106.1.196'. The protocol used was 'UDP'. It may be down or inaccessible.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: d5 04 00 00 ...

08.28.2004 at 05:24PM PDT, ID: 11923825

Rank: Savant

Sembee:

Can you ping that external DNS server from the Exchange server?
It is starting to look like your firewall isn't allowing DNS traffic to go out correctly. DNS is still a problem.
Try a nslookup test from a command window.

That last message "Rejected/Deleted by Intelligent Message Filter" indicates that the remote site is running Exchange 2003 with the new IMF that was introduced along side SP1 for Exchange. Your message has scored highly as spam and has been deleted - or your domain is on their blacklist.

These types of things don't happen for no reason - someone must have changed something or you have a piece of hardware about to fail.

Simon.

08.29.2004 at 09:29AM PDT, ID: 11926184

michaeltegler:

i can ping the dns server and the mail server to and from each other. nslookup to both dns servers is also fine.

is there a way i can set up a different smtp server (windows 2003 version) as a relay for outgoing mail?

08.29.2004 at 10:40AM PDT, ID: 11926462

Rank: Savant

Sembee:

Windows 2003 will act as a good email relay.
Install a new copy of Windows 2003 and add the SMTP service. Then configure it to accept email for your domain, then add the IP address/dns name to forward email to your Exchange server.
You could also look at using something like GFI Mail Essentials to work as the gateway server. You need to check that the new relay machine can do dns lookups as well - that it isn't getting the same UDP errors that the other machine is getting.

Simon.

08.29.2004 at 11:14AM PDT, ID: 11926570

michaeltegler:

i'll try that, thanks. also is there a way to check udp specfically?

08.29.2004 at 03:30PM PDT, ID: 11927617

michaeltegler:

setting up a new relay server didn't work. instead of all the individual queue getting this "the connection was dropped due to an SMTP protocol sink" message just the queue to the relay server was.

at this point i'm going to try to re-install service pack 1. thinking there's some corruption in the exchange install. i too believe something has changed on the network though nothing i can trace.

08.29.2004 at 03:38PM PDT, ID: 11927644

michaeltegler:

alright i'm trying to set up the "internet mail wizard" in exchange. and i get an error "The SMTP virtual server "Default SMTP Virtual Server" on the selected server does not have the binding of all unassigned/port 25.

how do i bind the server to the port? i suspect this might be my problem

08.29.2004 at 04:23PM PDT, ID: 11927777

michaeltegler:

actually i just sorted that issue. but now i'm not recieving e-mail.

08.30.2004 at 04:32AM PDT, ID: 11929951

Rank: Savant

Sembee:

If you are not receving email then the first thing to try is a dnsreport.com test on your domain. This will tell you whether it is an external DNS problem or that port 25 traffic is being blocked.

Simon.

08.30.2004 at 05:49AM PDT, ID: 11930422

michaeltegler:

i fixed this. disabling the anti-virus, re-installing smtp, then re-installing exchange. bout 12 hours now. wanted to thank everyone for their help with this so i split the points.

Abs_jaipur

04.02.2008 at 04:07AM PDT, ID: 21261697

Hi,

Are you sending mail through the web server or using any other mail server to send mail. Once use smtp host as localhost and check if the mail deliver or not.

Abs_jaipur

04.02.2008 at 04:09AM PDT, ID: 21261704

sorry for my previous comment

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