How To Fix GW639 - Failed to send datagram

SAP Error Message - Details

• Message type: E = Error

• Message class: GW - Message Texts for Gateway

• Message number: 639

• Message text: Failed to send datagram

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message GW639 - Failed to send datagram ?

  The SAP error message GW639 "Failed to send datagram" typically indicates an issue with the communication between the SAP system and an external system or service, often related to the SAP Gateway. This error can arise due to various reasons, including network issues, configuration problems, or resource limitations.
  Causes:
  
  Network Issues: Problems with the network connection, such as firewalls blocking traffic, DNS resolution issues, or network outages.
  Configuration Errors: Incorrect settings in the SAP Gateway configuration or in the external system's configuration.
  Resource Limitations: Insufficient resources on the SAP system or the external system, such as memory or CPU constraints.
  Timeouts: The datagram may not be sent due to timeouts in the communication process.
  SAP Gateway Settings: Issues with the SAP Gateway settings, such as incorrect port numbers or IP addresses.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the SAP system and the external system is stable. Use tools like ping or traceroute to diagnose connectivity issues.
  Review Firewall Settings: Verify that firewalls are not blocking the necessary ports for SAP communication. Ensure that the required ports are open for both inbound and outbound traffic.
  Validate Configuration: Check the configuration settings in the SAP Gateway and the external system. Ensure that the IP addresses, ports, and other parameters are correctly set.
  Monitor System Resources: Use monitoring tools to check the resource usage on both the SAP system and the external system. If resources are low, consider optimizing or upgrading the hardware.
  Increase Timeout Settings: If timeouts are suspected, consider increasing the timeout settings in the SAP Gateway configuration.
  Check SAP Notes: Look for relevant SAP Notes that may address this specific error. SAP frequently releases updates and patches that can resolve known issues.
  Review Logs: Check the SAP Gateway logs and system logs for any additional error messages or warnings that could provide more context about the issue.
  
  Related Information:
  
  SAP Gateway Configuration: Familiarize yourself with the SAP Gateway configuration settings, which can be found in transaction code SMGW.
  SAP Notes: Search the SAP Support Portal for notes related to GW639 or similar communication errors.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your network or system administrators for further investigation.