Exchange 2007 421 4.3.2 Service not available, closing transmission channel

Hi,

Just switch ISP and having issues with mail flow with exchange 2007
when sending an email to the domain I receive a Email Delivery Warning 4.3.2 Service not available, closing transmission channel

Regards
LVL 1
Ben SAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Valentina PerezExchange ServersCommented:
Hi Ben,

You need to check if you have backpressure. Do you have any events between 15000-15010?

Regards
Valentina
0
Zaheer IqbalTechnical Assurance & ImplementationCommented:
is this issues with outgoing mails or incoming or both ?
0
Ben SAuthor Commented:
Hi

No events in the events viewer between 15000-15010.
outgoing is working but taking longer than normal to receive, around 15 minutes.

Regards,
Ben
0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

Ben SAuthor Commented:
from the Microsoft connection test


The Microsoft Connectivity Analyzer failed to test inbound SMTP mail flow.
 	
	Additional Details
 	
Elapsed Time: 584 ms.
 	
	Test Steps
 	
	Attempting to retrieve DNS MX records for domain 'b.co.uk'.
 	One or more MX records were successfully retrieved from DNS.
 	
	Additional Details
 	
MX Records Host remote.b.co.uk, Preference 5
Elapsed Time: 16 ms.
	Testing Mail Exchanger remote.b.co.uk.
 	One or more SMTP tests failed for this Mail Exchanger.
 	
	Additional Details
 	
Elapsed Time: 567 ms.
 	
	Test Steps
 	
	Attempting to resolve the host name remote.b.co.uk in DNS.
 	The host name resolved successfully.
 	
	Additional Details
 	
IP addresses returned: 
Elapsed Time: 353 ms.
	Testing TCP port 25 on host remote.b.co.uk to ensure it's listening and open.
 	The port was opened successfully.
 	
	Additional Details
 	
Banner received: 421 4.3.2 Service not available, closing transmission channel
Elapsed Time: 140 ms.
	Analyzing SMTP Capabilities for server remote.b.co.uk:25
 	The test passed with some warnings encountered. Please expand the additional details.
 	
	Additional Details
 	
Unabled to determine SMTP capabilities. Reason: Unexpected SMTP server response. Expected: 220, actual: 421, whole response: 421 4.3.2 Service not available, closing transmission channel
Elapsed Time: 38 ms.
	Attempting to send a test email message to administrator@b.co.uk using MX remote.b.co.uk.
 	Delivery of the test email message failed.
 	
	Additional Details
 	
The server returned status code 421 - Service not available, closing transmission channel. The server response was: 4.3.2 Service not available, closing transmission channel
Exception details:
Message: Service not available, closing transmission channel. The server response was: 4.3.2 Service not available, closing transmission channel
Type: System.Net.Mail.SmtpException
Stack trace:
at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()
Elapsed Time: 36 ms.

Open in new window

0
Zaheer IqbalTechnical Assurance & ImplementationCommented:
Not sure of your configuration and setup please check your receive connectors on the CAS.
0
Zaheer IqbalTechnical Assurance & ImplementationCommented:
Have you updated your MX record to new ISP IP.
0
Ben SAuthor Commented:
I have updated the mx record with DNS provided and added the new IP to the receive connector remote IP, is this correct?
0
Zaheer IqbalTechnical Assurance & ImplementationCommented:
Try MXToolbox.com and see what that comes back does it come back with the correct IP ?
0
Zaheer IqbalTechnical Assurance & ImplementationCommented:
Has a reverse DNS record been setup for your mail by the new ISP ?
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Ben SAuthor Commented:
Just figured out the issue thanks for the help,

I just added 0.0.0.0-255.255.255.255  to the internet receive connector
0
Ben SAuthor Commented:
should this be 0.0.0.0-255.255.255.255 or just the public IP of the exchange server?
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.