How To Fix RZ387 - A host name must be specified

SAP Error Message - Details

• Message type: E = Error

• Message class: RZ - Messages for Computing Center Management System

• Message number: 387

• Message text: A host name must be specified

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message RZ387 - A host name must be specified ?

  The SAP error message RZ387, which states "A host name must be specified," typically occurs when there is an issue with the configuration of the SAP system, particularly in relation to the network settings or when trying to connect to a system or service that requires a hostname.
  Cause:
  
  Missing Hostname: The most common cause is that a hostname has not been specified in the configuration settings where it is required.
  Incorrect Configuration: The configuration for the system or service may be incomplete or incorrect, leading to the system not being able to resolve the hostname.
  Network Issues: There may be underlying network issues that prevent the hostname from being resolved, such as DNS problems.
  SAP Profile Parameters: Certain profile parameters may not be set correctly, leading to the system not being able to identify the hostname.
  
  Solution:
  
  
  Check Configuration:
  
  Go to the relevant configuration settings in the SAP system (e.g., transaction codes like RZ10 for profile parameters).
  Ensure that the hostname is specified correctly in the relevant fields.
  
  
  
  Update Profile Parameters:
  
  Use transaction RZ10 to check and update the instance profile parameters.
  Look for parameters like rdisp/mshost, rdisp/hostname, or any other parameters that may require a hostname.
  
  
  
  DNS Configuration:
  
  Ensure that the DNS settings on the server are correctly configured and that the hostname can be resolved.
  You can test this by using commands like ping <hostname> or nslookup <hostname> from the command line.
  
  
  
  Check Network Connectivity:
  
  Verify that there are no network issues preventing the SAP system from reaching the specified hostname.
  Check firewall settings or any network policies that might block access.
  
  
  
  Restart the SAP System:
  
  After making changes to the configuration, it may be necessary to restart the SAP system for the changes to take effect.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  Transaction Codes: RZ10 (Profile Maintenance), RZ11 (Profile Parameter Maintenance), RZ03 (Display Instance Profile).
  SAP Documentation: Refer to the official SAP Help Portal for detailed documentation on system configuration and network settings.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the RZ387 error and ensure that the hostname is correctly specified in your SAP system configuration.