How To Fix E0556 - Host destination '&' not known

SAP Error Message - Details

• Message type: E = Error

• Message class: E0 - SAP EDI messages

• Message number: 556

• Message text: Host destination '&' not known

What causes this issue?

The host destination specified does not exist in the table of host
destinations TXCOM.

System Response

A warning is issued, since the host destination must be correct for
sending IDocs.

How to fix this error?

Please maintain the host destination in the table TXCOM.

<DS:TRAN.SM54>Execute function</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E0556 - Host destination '&' not known ?

  The SAP error message E0556, which states "Host destination '&' not known," typically occurs when the system is unable to resolve the specified host destination. This can happen in various contexts, such as when trying to send emails, print documents, or connect to external systems.
  Causes:
  
  Incorrect Host Name: The specified host name or destination is misspelled or does not exist in the system.
  Missing Configuration: The destination may not be configured in the SAP system (e.g., in transaction SCOT for email or SPAD for printing).
  Network Issues: There may be network connectivity issues preventing the SAP system from reaching the specified host.
  DNS Resolution Problems: The DNS server may not be able to resolve the host name to an IP address.
  Authorization Issues: The user or system may not have the necessary permissions to access the specified host.
  
  Solutions:
  
  Check Host Name: Verify that the host name specified in the configuration is correct. Look for typos or incorrect entries.
  Configure Destination:
  
  For email, check the configuration in transaction SCOT (SAPconnect) to ensure that the host is defined correctly.
  For printing, check the configuration in transaction SPAD (Spool Administration) to ensure that the output device is set up correctly.
  
  
  Test Connectivity: Use tools like ping or telnet from the server where SAP is running to check if the host is reachable.
  DNS Configuration: Ensure that the DNS settings on the SAP server are correct and that the DNS server can resolve the host name.
  Check Authorizations: Ensure that the user or system has the necessary authorizations to access the specified host.
  
  Related Information:
  
  Transaction Codes:
  
  SCOT: SAPconnect settings for email configuration.
  SPAD: Spool administration for printer configuration.
  
  
  Logs and Traces: Check the system logs (transaction SM21) and the developer traces (transaction ST22) for additional error messages that may provide more context.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to this error message.
  
  If the problem persists after checking the above points, it may be helpful to consult with your network administrator or SAP Basis team for further investigation.