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The SMTP Send Adapter is not able to connect to an email server

Troubleshooting


Problem

The SMTP Send Adapter is configured properly, but is not able to connect to an email server.

Symptom

  • All attempts to connect to an email server using the SMTP Send Adapter fail
  • Errors in the noapp.log for each attempt to connect like:
    • ALL 000000000000 GLOBAL_SCOPE com.sun.mail.util.MailConnectException: Couldn't connect to host, port: <email server name or address>, <port#>; timeout 30000;
  • Errors in the system.log for each attempt to connect like:
    • ERROR [1675966985250] Couldn't connect to host, port: <email server name or IP address>, <port#>; timeout 30000
    • ERROR 000000000000 GLOBAL_SCOPE B2BMailServiceA, retry = 1 , total retries = 1 com.sun.mail.util.MailConnectException: Couldn't connect to host, port: <email server name or address>, <port#>; timeout 30000;
  • A TCP capture shows a set of packets like the following for each attempt to connect. [Note, filtering may be required to see just the target stream.]
    • Sent by        Content
    • SB2BI(client)    TCP SYN
    • email server    TCP SYN,ACK
    • client        TCP ACK
    • client      TLS Client Hello
    • email server    TCP ACK (for prvious packet)
    • email server      TCP 220 message from server which includes server name, type, "ready" declaration, and date/time stamp
    • client        TCP ACK (for previous packet)
    • client      TLS Fatal Alert due to "unexpected message"
    • client      TCP FIN,ACK
    • email server      TCP ACK
    • email server      TCP FIN, ACK
    • client      TCP ACK

Document Location

Worldwide

[{"Type":"MASTER","Line of Business":{"code":"LOB77","label":"Automation Platform"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SS3JSW","label":"IBM Sterling B2B Integrator"},"ARM Category":[{"code":"a8m50000000CjxBAAS","label":"Protocol-\u003ESMTP"}],"ARM Case Number":"TS010711571","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Versions"}]

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Document Information

Modified date:
23 May 2023

UID

ibm16997657

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