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Status Planned for future release
Workspace Db2 for z/OS
Created by Guest
Created on Mar 22, 2022

Blocking Db2 connections to reduce the DSNL030I message flooding.

Often times, an invalid password or a revoked ID results in DSNL030I message. Some web based applications does not have error handling for this message and keeps on trying to connect to Db2 sometimes at a rate of hundreds per second. This flood of DSNL030I / ICH408I message fills up the ECSA. There is also a risk in the Db2 MSTR address space to reach maximum number of lines and then crashing. Even an invalid RACF ID can result in DSNL030I message. This idea is to either provide a way to suppress the repeated messages or be able to block certain IP addresses at the z/OS or network level.

The existing functionality only accespts IP address. Further filtering it to a specific AUTHID is needed. Multiple application connections using different IDs also use the same IP address. Therefore it will not be nice to block the whole server.

Needed By Yesterday (Let's go already!)
  • Guest
    Mar 30, 2022

    Thanks Janet.

    It works but it blocks all the users coming from the IP address. When I filter just by a specific USER for that IP, the profile was rejected. For majority of our DSNL030I messages, the same IP address is used by other users coming from that server. I only want to disallow the connection coming from the specific AUTHID and allow other valid users coming from that IP address.

  • Admin
    Janet Figone
    Mar 25, 2022

    Dear Eduardo, Thank you for submitting this Aha Idea. We are pleased to inform you this functionality already exists.

    Currently, you can block an IP address from being able to CONNECT to Db2. Enabling a Db2 MONITOR CONNECTIONS system profile to prevent any connections into Db2 originating from the offending IP.


    The Db2 for z/OS Team

  • Guest
    Mar 24, 2022

    There is already a way to block. You an make entries in DSN_PROFILE_TABLE and DSN_PROFILE_ATTRIBUTES to add exception for thread/connection.