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e2k7 sp3: smtp - closing transmission channel

Posted on 2013-01-09
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Last Modified: 2013-01-29
Most of the time I am getting this error when sending an e-mail with my POP/SMTP account:
Task 'user@domain2.com - Sending' reported error (0x800CCC67) : 
The server responded: 421 4.3.2 Service not available, closing transmission channel'

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All my accounts are hosted in-house (CCR cluster and 1 CAS/HUB server [all servers w2k8 + e2k7 SP3 all Update Rollups & pached]).

My mailbox has multiple SMTP addresses configured - the main one works fine (the one that is configured as type Microsoft exchange in outlook 2010 works fine).
The problem I am having is with the POP accounts; the other SMTP addresses configured on my account in exchange (we operate multiple domains etc.). Other users are experiencing the same issues with their pop accounts for the secondary smtp addresses.

Can you assist me in pinpointing the cause? every few hours the e-mails will be sent with no intervention, but most of the time we'd get this service not available message.

I had a look on CAS/HUB and in C:\Program Files\Microsoft\Exchange Server\TransportRoles\Logs\ProtocolLog\SmtpReceive and when I get the error in outlook this is logged:
2013-01-09T14:04:22.075Z,,08CFA82464B20766,0,ip:25,my_IP:10261,+,,
2013-01-09T14:04:22.075Z,,08CFA82464B20766,1,ip:25,my_IP:10261,>,"421 4.3.2 Service not available, closing transmission channel",
2013-01-09T14:04:22.075Z,,08CFA82464B20766,2,ip:25,my_IP:10261,-,,Local

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then every once in a while - the e-mail will be sent with no intervention:
2013-01-09T14:45:30.084Z,CASnHUB\Default CASnHUB,08CFB***85387791,0,ip:25,my_IP:12296,+,,
2013-01-09T14:45:30.084Z,CASnHUB\Default CASnHUB,08CFB***85387791,1,ip:25,my_IP:12296,*,SMTPSubmit SMTPAcceptAnySender SMTPAcceptAuthoritativeDomainSender AcceptRoutingHeaders,Set Session Permissions
2013-01-09T14:45:30.084Z,CASnHUB\Default CASnHUB,08CFB***85387791,2,ip:25,my_IP:12296,>,"220 CASnHUB.domain.com Microsoft ESMTP MAIL Service ready at Wed, 9 Jan 2013 14:45:29 +0000",
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,3,ip:25,my_IP:12296,<,EHLO GD7xw6200,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,4,ip:25,my_IP:12296,>,250-CASnHUB.domain.com Hello [my_IP],
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,5,ip:25,my_IP:12296,>,250-SIZE,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,6,ip:25,my_IP:12296,>,250-PIPELINING,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,7,ip:25,my_IP:12296,>,250-DSN,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,8,ip:25,my_IP:12296,>,250-ENHANCEDSTATUSCODES,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,9,ip:25,my_IP:12296,>,250-STARTTLS,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,10,ip:25,my_IP:12296,>,250-X-ANONYMOUSTLS,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,11,ip:25,my_IP:12296,>,250-AUTH NTLM,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,12,ip:25,my_IP:12296,>,250-X-EXPS GSSAPI NTLM,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,13,ip:25,my_IP:12296,>,250-8BITMIME,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,14,ip:25,my_IP:12296,>,250-BINARYMIME,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,15,ip:25,my_IP:12296,>,250-CHUNKING,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,16,ip:25,my_IP:12296,>,250-XEXCH50,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,17,ip:25,my_IP:12296,>,250 XRDST,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,18,ip:25,my_IP:12296,<,STARTTLS,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,19,ip:25,my_IP:12296,>,220 2.0.0 SMTP server ready,
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,20,ip:25,my_IP:12296,*,,Sending certificate
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,21,ip:25,my_IP:12296,*,"CN=CASnHUB.domain.com, OU=Domain Control Validated, O=CASnHUB.domain.com",Certificate subject
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,22,ip:25,my_IP:12296,*,"SERIALNUMBER=079***87, CN=Go Daddy Secure Certification Authority, OU=http://certificates.godaddy.com/repository, O=""GoDaddy.com, Inc."", L=Scottsdale, S=Arizona, C=US",Certificate issuer name
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,23,ip:25,my_IP:12296,*,27B0***F83EF45,Certificate serial number
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,24,ip:25,my_IP:12296,*,854B0***166663391409E02BD43CEE3DFDE8F7C3,Certificate thumbprint
2013-01-09T14:45:30.100Z,CASnHUB\Default CASnHUB,08CFB***85387791,25,ip:25,my_IP:12296,*,CASnHUB.domain.com;www.CASnHUB.domain.com;autodiscover.domain1.com;autodiscover.domain2.com;autodiscover.domain3.com;autodiscover.domain4.com;autodiscover.domain5.com;autodiscover.domain6.com;autodiscover.domain7.co.uk;autodiscover.domain8.com;autodiscover.domain9.com;autodiscover.domain10.com;webmail;domain11.com;webmail.domain12.com;webmail.domain13.com,Certificate alternate names
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,26,ip:25,my_IP:12296,<,EHLO MyMachineName,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,27,ip:25,my_IP:12296,>,250-CASnHUB.domain.com Hello [my_IP],
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,28,ip:25,my_IP:12296,>,250-SIZE,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,29,ip:25,my_IP:12296,>,250-PIPELINING,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,30,ip:25,my_IP:12296,>,250-DSN,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,31,ip:25,my_IP:12296,>,250-ENHANCEDSTATUSCODES,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,32,ip:25,my_IP:12296,>,250-AUTH NTLM LOGIN,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,33,ip:25,my_IP:12296,>,250-X-EXPS GSSAPI NTLM,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,34,ip:25,my_IP:12296,>,250-8BITMIME,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,35,ip:25,my_IP:12296,>,250-BINARYMIME,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,36,ip:25,my_IP:12296,>,250-CHUNKING,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,37,ip:25,my_IP:12296,>,250-XEXCH50,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,38,ip:25,my_IP:12296,>,250 XRDST,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,39,ip:25,my_IP:12296,<,AUTH NTLM,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,40,ip:25,my_IP:12296,>,334 <authentication response>,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,41,ip:25,my_IP:12296,>,334 <authentication response>,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,42,ip:25,my_IP:12296,*,SMTPSubmit SMTPSubmitForMLS SMTPAcceptAnyRecipient SMTPAcceptAuthenticationFlag SMTPAcceptAnySender SMTPAcceptAuthoritativeDomainSender BypassAntiSpam BypassMessageSizeLimit SMTPSendEXCH50 SMTPAcceptEXCH50 AcceptRoutingHeaders AcceptForestHeaders AcceptOrganizationHeaders SendRoutingHeaders SendForestHeaders SendOrganizationHeaders,Set Session Permissions
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,43,ip:25,my_IP:12296,*,domain\MyUserName,authenticated
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,44,ip:25,my_IP:12296,>,235 2.7.0 Authentication successful,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,45,ip:25,my_IP:12296,<,MAIL FROM: <user@domain2.com>,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,46,ip:25,my_IP:12296,*,08CFB***85387791;2013-01-09T14:45:30.084Z;1,receiving message
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,47,ip:25,my_IP:12296,>,250 2.1.0 Sender OK,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,48,ip:25,my_IP:12296,<,RCPT TO: <user@outlook.com>,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,49,ip:25,my_IP:12296,>,250 2.1.5 Recipient OK,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,50,ip:25,my_IP:12296,<,DATA,
2013-01-09T14:45:30.162Z,CASnHUB\Default CASnHUB,08CFB***85387791,51,ip:25,my_IP:12296,>,354 Start mail input; end with <CRLF>.<CRLF>,
2013-01-09T14:45:30.381Z,CASnHUB\Default CASnHUB,08CFB***85387791,52,ip:25,my_IP:12296,>,250 2.6.0 <000001cdee77$f86af***$e940d9f0$@domain2.com> Queued mail for delivery,
2013-01-09T14:45:32.881Z,CASnHUB\Default CASnHUB,08CFB***85387791,53,ip:25,my_IP:12296,<,QUIT,
2013-01-09T14:45:32.881Z,CASnHUB\Default CASnHUB,08CFB***85387791,54,ip:25,my_IP:12296,>,221 2.0.0 Service closing transmission channel,
2013-01-09T14:45:32.881Z,CASnHUB\Default CASnHUB,08CFB***85387791,55,ip:25,my_IP:12296,-,,Local

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FYI these are the connectors configured:
Client_Receive_Connector.jpgdefault receive connector configurationRelay_Receive_Connector.jpg
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Question by:ee-gd
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Manpreet SIngh Khatra earned 500 total points
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by:ee-gd
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We've no errors in EXBPA and since this is intermittent was difficult to track. This seems to be outlook 2010 account configuration issue.

On my machine I can only replicate the issue if I set the SMTP setting for encryption in outlook 2010 to be AUTO instead of TLS, but some remote users claim they definitely have selected TLS...
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