How To Fix GW677 - Timeout while waiting for a connection to be established

SAP Error Message - Details

• Message type: E = Error

• Message class: GW - Message Texts for Gateway

• Message number: 677

• Message text: Timeout while waiting for a connection to be established

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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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message GW677 - Timeout while waiting for a connection to be established ?

  The SAP error message GW677, which indicates a "Timeout while waiting for a connection to be established," typically occurs in the context of SAP Gateway or when trying to establish a connection to an SAP system. This error can arise due to various reasons, including network issues, configuration problems, or resource limitations. Below are some common causes, potential solutions, and related information:
  Causes:
  
  Network Issues: There may be network connectivity problems between the client and the SAP server, such as firewalls blocking the connection or network latency.
  Server Overload: The SAP server may be overloaded with requests, leading to delays in establishing new connections.
  Configuration Errors: Incorrect configuration settings in the SAP Gateway or the application server can lead to connection timeouts.
  Resource Limitations: Insufficient resources (CPU, memory) on the SAP server can cause delays in processing requests.
  Timeout Settings: The timeout settings in the SAP system or the client application may be set too low, causing premature timeouts.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Verify that the network connection between the client and the SAP server is stable.
  Use tools like ping or traceroute to diagnose network issues.
  
  
  
  Review SAP Gateway Configuration:
  
  Check the configuration of the SAP Gateway (transaction code SMGW) to ensure it is set up correctly.
  Look for any errors or warnings in the Gateway logs.
  
  
  
  Monitor Server Performance:
  
  Use transaction codes like SM50 or SM66 to monitor the performance of the SAP server and check for any resource bottlenecks.
  If the server is overloaded, consider optimizing the workload or increasing server resources.
  
  
  
  Adjust Timeout Settings:
  
  Review and adjust the timeout settings in the SAP system and the client application. This can often be done in the configuration files or through transaction codes.
  For example, you can check the rdisp/timeout parameter in the SAP profile.
  
  
  
  Check for Locks:
  
  Use transaction code SM12 to check for any locks that might be preventing connections from being established.
  
  
  
  Review Logs:
  
  Check the SAP system logs (transaction code SM21) and the Gateway logs for any additional error messages that might provide more context.
  
  
  
  Restart Services:
  
  If the issue persists, consider restarting the SAP Gateway or the application server to clear any temporary issues.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues related to the GW677 error. SAP frequently updates their knowledge base with solutions for common problems.
  Documentation: Refer to the official SAP documentation for detailed information on configuring the SAP Gateway and troubleshooting connection issues.
  Support: If the problem cannot be resolved, consider reaching out to SAP support for assistance.
  
  By following these steps, you should be able to diagnose and resolve the GW677 timeout error effectively.