KB439853: MicroStrategy Narrowcast services fail with segmentation errors: “Unable to close the Subscription Book” “Segmentation failed” “Service execution finished with error”

SYMPTOM:
After installing a new Windows update, some Narrowcast services fail with segmentation errors:

“Service ID [19B0AFFBE2614950A07A6C418F273A19] Execution ID [C01D72ACF71C4B8BBFF7A7EDF3ACE5A7] Segment ID [........]Unable to close the Subscription Book[EC-MSI-CST1::DM]:6588:[THR:0x18a0][12/08/2016 10:21:42.872][Level:Minor Error][Code:0xa97]“
 
“Service ID [19B0AFFBE2614950A07A6C418F273A19] Execution ID [C01D72ACF71C4B8BBFF7A7EDF3ACE5A7] Segment ID [........]Segmentation failed [Subscription Set ID: 7F584735BF2A4ACEB2E9A02FBAA66CCE][EC-MSI-CST1::DM]:6588:[THR:0x18a0][12/08/2016 10:21:42.872][Level:Moderate Error][Code:0xa98]“
 
“Service ID [19B0AFFBE2614950A07A6C418F273A19] Execution ID [C01D72ACF71C4B8BBFF7A7EDF3ACE5A7] Segment ID [........]Service execution finished with error.[EC-MSI-CST1::DM]:6588:[THR:0x18a0][12/08/2016 10:21:42.872][Level:Moderate Error][Code:0x963]”

 
CAUSE
This is a known issue with Narrowcast Server installed on Windows 2012 R2 with Windows Update KB4467703 and all subsequent versions of Windows. This issue has been logged to Strategy Technology team and has a confirmed fix for Strategy 2019 Update 1.
 
ACTION:

1. In the Windows Registry, set the value of LEVEL_TRACE_SBM to 1 in the below path:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MicroStrategy\Strategy Broadcast Server\7.0\Distributed Logging Service\MLS Client Settings\Logging Levels

If the above workaround is not working, please contact Strategy support for an update on this issue.

1. Upgrade to Strategy 2019 Update 1 once available in late March 2019.

If (1) does not resolve the issue and (2) is not possible, then contact Strategy Technical Support for further assistance.
KB439853