Why is CA Datacom Multi-User (MUF) startup now showing message:

DB00270W - ACCESS TO DATACOM TABLES NOT PROTECTED BY EXTERNAL SECURITY 

z/OS

The DB00270W message was an enhancement provided for customers who required a positive message to note that no external security is executing for the Datacom MUF being enabled.

The DB00270W message is informational.

In this case, the customer has an external security package (CA Top Secret) and had chosen not to turn on external security in the Datacom Multi-User.

From the CA Datacom Messages  https://docops.ca.com/ca-datacom-messages/en

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DB00270W ACCESS TO DATACOM TABLES NOT PROTECTED BY EXTERNAL SECURITY 

Reason: 
Access to Datacom tables has not been secured using External Security. None of the Paths used to access the data in Datacom tables is protected by External Security. It is likely that any user who can communicate with the Multi-User Facility (MUF) can obtain and modify data. 

Action: 
Consider enabling External Security for Datacom/DB. 

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Also, note that the DB00270W message can be suppressed from display at MUF startup using startup option:

MESSAGE  NO,DB00270