IBM Support

Scheduled activities are stuck in 'Waiting' status with CNC-SDS-0408 There are email messages waiting to be sent

Troubleshooting


Problem

Scheduled email activities accumulate in 'Waiting' status over time, impacting scheduled reports, jobs, and event agent tasks.
Running the NC drop script and recycling services temporarily clears out the items in 'Waiting' status, but the number of items grows as more emails are sent out.

Symptom

1. In the run history, error codes such as "CNC-SDS-0408 There are email messages waiting to be sent" are found.
2. In a generated thread dump or javacore file, SMTP threads are locked, as indicated by "JMS.Session.QueueSession.SMTP" messages.

Document Location

Worldwide

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Document Information

Modified date:
15 January 2026

UID

ibm17054049