How To Fix WTY139 - Callback could not be created

SAP Error Message - Details

• Message type: E = Error

• Message class: WTY - Warranty processing

• Message number: 139

• Message text: Callback could not be created

Self-Explanatory Message

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• What is the cause and solution for SAP error message WTY139 - Callback could not be created ?

  SAP Error Message:
  
  WTY139 - Callback could not be created
  
  Cause:
  The error message WTY139 typically occurs in SAP when the system attempts to create a callback connection for a remote function call (RFC) or a dialog process, but fails. This failure can be due to several reasons, including:
  
  Network issues: The system cannot establish a network connection back to the calling system.
  Incorrect or missing gateway configuration: The SAP Gateway is not properly configured or not running on the target system.
  Authorization problems: The user or system does not have the necessary authorizations to create the callback.
  Incorrect system parameters: Parameters related to the gateway or callback are incorrectly set.
  Firewall or security settings: Firewalls or security settings block the callback connection.
  DNS or hostname resolution issues: The system cannot resolve the hostname or IP address of the calling system.
  
  
  Explanation:
  In SAP, a callback is a mechanism where the called system initiates a connection back to the calling system to complete a dialog or RFC communication. This is common in distributed environments where dialog steps or RFC calls require a return connection.
  When the callback cannot be created, the communication is interrupted, and the system raises the WTY139 error.
  
  Solution:
  
  
  Check SAP Gateway Status:
  
  Ensure that the SAP Gateway is running on both the calling and called systems.
  Use transaction SMGW to check the gateway status.
  Restart the gateway if necessary.
  
  
  
  Verify Network Connectivity:
  
  Test network connectivity between the systems using ping or telnet on the gateway port (default 3300 + system number).
  Ensure no firewall or network device blocks the callback port.
  
  
  
  Check System Parameters:
  
  Verify parameters related to the gateway and callback in RZ10 or RZ11:
  
  gw/acl_mode (Access Control List mode)
  gw/acl_info (Access Control List file)
  gw/enable_compression
  gw/reg_info (Gateway registration info)
  
  
  Ensure these parameters are correctly set and consistent across systems.
  
  
  
  Check Hostname Resolution:
  
  Ensure that the hostname of the calling system is resolvable from the called system.
  Use OS commands like nslookup or ping to verify.
  If necessary, update /etc/hosts or DNS entries.
  
  
  
  Review Authorizations:
  
  Check that the user executing the callback has the necessary authorizations.
  Review roles and profiles assigned to the user.
  
  
  
  Check Gateway Access Control List (ACL):
  
  If ACL is enabled (gw/acl_mode), ensure the calling system's IP or hostname is allowed in the ACL file.
  The ACL file is usually located in the /usr/sap/<SID>/SYS/profile directory.
  
  
  
  SAP Notes and Support:
  
  Search for relevant SAP Notes for WTY139 for your SAP version.
  Example SAP Note: 0001234567 (replace with actual note number if available)
  Contact SAP Support if the problem persists.
  
  
  
  
  Related Information:
  
  Transaction SMGW: Gateway Monitor to check gateway status and connections.
  Transaction RZ10 / RZ11: To check and maintain system parameters.
  SAP Gateway: The communication layer that handles RFC and dialog connections.
  RFC (Remote Function Call): Mechanism for communication between SAP systems.
  Network and Security: Firewalls, ports, and DNS must be configured correctly for callback connections.
  SAP Help Portal: Documentation on SAP Gateway and RFC communication.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WTY139 - Callback could not be created
  
  
  Cause
  Network issues, gateway not running, incorrect parameters, authorization or firewall issues
  
  
  Solution
  Check gateway status, verify network connectivity, check system parameters, review ACL and authorizations, ensure hostname resolution
  
  
  Tools
  SMGW, RZ10, RZ11, OS network commands
  
  
  Additional
  Consult SAP Notes and SAP Support if needed
  
  
  
  
  If you provide more context (e.g., system landscape, when the error occurs), I can help tailor the troubleshooting steps further.