How To Fix CNV_DMC_HC018 - Error when connecting to &1 DB connection &2 for mass transfer ID &3

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_HC -

• Message number: 018

• Message text: Error when connecting to &1 DB connection &2 for mass transfer ID &3

What causes this issue?

The SAP Landscape Transformation Replication Server system is not able
to reach a source or target system which is connected by means of a
database connection.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

In the SAP Landscape Transformation Replication Server system, go to
transaction SE38 and run report ADBC_TEST_CONNECTION using the
connection name, and ensure that the connection is working correctly.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_HC018 - Error when connecting to &1 DB connection &2 for mass transfer ID &3 ?

  The SAP error message CNV_DMC_HC018 typically occurs during data migration processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that there is an issue with the database connection specified in the migration process.
  Cause:
  The error can be caused by several factors, including:
  
  Incorrect Database Connection Parameters: The connection details (like hostname, port, username, password) for the database might be incorrect.
  Database Unavailability: The target database might be down or not reachable due to network issues.
  Insufficient Permissions: The user account used for the database connection may not have the necessary permissions to access the database or perform the required operations.
  Configuration Issues: There may be misconfigurations in the SAP system or the database settings that prevent a successful connection.
  Firewall or Security Settings: Firewalls or security settings may be blocking the connection to the database.
  
  Solution:
  To resolve the CNV_DMC_HC018 error, you can follow these steps:
  
  
  Verify Connection Parameters:
  
  Check the database connection parameters in the DMC configuration. Ensure that the hostname, port, username, and password are correct.
  
  
  
  Test Database Connectivity:
  
  Use tools like ping or telnet to check if the database server is reachable from the SAP application server.
  If possible, use a database client to test the connection with the same parameters.
  
  
  
  Check Database Status:
  
  Ensure that the database is up and running. If it is down, restart the database service.
  
  
  
  Review User Permissions:
  
  Verify that the user account used for the connection has the necessary permissions to access the database and perform the required operations.
  
  
  
  Check Configuration Settings:
  
  Review the configuration settings in both the SAP system and the database to ensure they are set up correctly.
  
  
  
  Firewall and Security Settings:
  
  Check if there are any firewall rules or security settings that might be blocking the connection. Adjust them as necessary.
  
  
  
  Consult Logs:
  
  Review the SAP application logs and database logs for any additional error messages or warnings that could provide more context about the issue.
  
  
  
  SAP Notes and Documentation:
  
  Check the SAP Support Portal for any relevant SAP Notes or documentation related to the CNV_DMC_HC018 error for additional troubleshooting steps or patches.
  
  
  
  Related Information:
  
  SAP Data Migration Cockpit (DMC): A tool used for data migration in SAP systems, which allows for the transfer of data from legacy systems to SAP S/4HANA or other SAP solutions.
  Database Connection Types: Understanding the type of database you are connecting to (e.g., HANA, Oracle, SQL Server) can help in troubleshooting specific connection issues.
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered similar issues.
  
  If the problem persists after following these steps, consider reaching out to SAP support for further assistance.