How To Fix D4126 - Unable to retrieve IBM iSeries host name

SAP Error Message - Details

• Message type: E = Error

• Message class: D4 - DB2/400 specific messages

• Message number: 126

• Message text: Unable to retrieve IBM iSeries host name

What causes this issue?

The host name of the AS/400 could not be retrieved. A call to an
internal OS/400 API failed.

System Response

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How to fix this error?

Create a problem message using the SAPNet - SAP Frontend.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message D4126 - Unable to retrieve IBM iSeries host name ?

  The SAP error message D4126, "Unable to retrieve IBM iSeries host name," typically indicates an issue with the connection between SAP and the IBM iSeries (AS/400) system. This error can arise due to various reasons, including configuration issues, network problems, or incorrect settings in the SAP system.
  Causes:
  
  Network Connectivity Issues: There may be a problem with the network connection between the SAP system and the IBM iSeries server.
  Incorrect Configuration: The SAP system may not be correctly configured to connect to the iSeries host. This includes incorrect host names, IP addresses, or port numbers.
  DNS Resolution Problems: If the SAP system relies on DNS to resolve the iSeries host name, there may be issues with DNS configuration or the DNS server itself.
  Firewall Restrictions: Firewalls may be blocking the necessary ports for communication between the SAP system and the iSeries.
  SAP Kernel Issues: There may be a problem with the SAP kernel version that is being used, which could affect connectivity.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the SAP system can reach the iSeries server. You can use tools like ping or traceroute to verify connectivity.
  Verify Configuration Settings: Check the configuration settings in the SAP system for the iSeries connection. Ensure that the host name, IP address, and port number are correct.
  DNS Configuration: If using DNS, verify that the iSeries host name can be resolved correctly. You can use the nslookup command to check DNS resolution.
  Firewall Settings: Review firewall settings to ensure that the necessary ports for SAP and iSeries communication are open.
  SAP Kernel Update: If you suspect a kernel issue, consider updating to the latest version of the SAP kernel that is compatible with your system.
  Check SAP Notes: Look for relevant SAP Notes that may address this specific error. SAP Notes often contain patches or configuration tips that can resolve issues.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for detailed information on configuring connections to IBM iSeries.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  IBM iSeries Documentation: Consult IBM documentation for any specific settings or configurations required for SAP connectivity.
  
  If the issue persists after trying the above solutions, it may be beneficial to involve your network or system administrator for further investigation.