How To Fix GW751 - Timeout during logon to server

SAP Error Message - Details

• Message type: E = Error

• Message class: GW - Message Texts for Gateway

• Message number: 751

• Message text: Timeout during logon to server

What causes this issue?

The gateway has sent a login to the application server. This process was
taking too long and was therefore cancelled. The time period is defined
by parameter gw/accept_timeout.
There are two reasons for this error:
The application server has rejected the request (internal error)
All work processes were busy and the request could not be processed in
the given time. In this case, error CONV_ID_NOT_FOUND is returned to the
server since the gateway has already deleted this connection.

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 GW751 - Timeout during logon to server ?

  The SAP error message GW751, which indicates a "Timeout during logon to server," typically occurs when there is a delay or failure in establishing a connection to the SAP server. This can be due to various reasons, including network issues, server performance problems, or configuration errors.
  Causes:
  
  Network Issues: Poor network connectivity, high latency, or network interruptions can lead to timeouts.
  Server Performance: If the SAP server is under heavy load or experiencing performance issues, it may not respond in a timely manner.
  Configuration Errors: Incorrect settings in the SAP GUI or the server configuration can lead to connection problems.
  Firewall/Proxy Settings: Firewalls or proxy servers may block or slow down the connection to the SAP server.
  SAP System Down: The SAP system might be down for maintenance or experiencing outages.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Ensure that your network connection is stable and that you can reach the SAP server.
  Use tools like ping or tracert to diagnose network issues.
  
  
  
  Server Status:
  
  Verify that the SAP server is up and running. You can check with your system administrator or use monitoring tools.
  If the server is under heavy load, consider waiting for a less busy time to log in.
  
  
  
  Configuration Settings:
  
  Review the SAP GUI settings to ensure that the connection parameters (like the application server, instance number, etc.) are correct.
  Check the timeout settings in the SAP GUI and increase them if necessary.
  
  
  
  Firewall/Proxy Configuration:
  
  Ensure that your firewall or proxy settings allow traffic to the SAP server.
  Consult with your network administrator to verify that the necessary ports are open.
  
  
  
  SAP Notes and Support:
  
  Check the SAP Support Portal for any relevant SAP Notes that might address this issue.
  If the problem persists, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  SAP GUI Version: Ensure that you are using a compatible version of the SAP GUI for your SAP system.
  System Logs: Check the system logs (transaction SM21) for any related error messages that might provide more context.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and found solutions.
  
  By systematically checking these areas, you should be able to identify and resolve the cause of the GW751 timeout error.