How To Fix B1604 - No connection to SAP gateway (TXCOM destination &); see SAP system log

SAP Error Message - Details

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 604

• Message text: No connection to SAP gateway (TXCOM destination &); see SAP system log

What causes this issue?

No connection could be made to the SAP gateway with TXCOM destination
&v1&.

How to fix this error?

Check the gateway and supply the TXCOM with the correct values where
necessary.
The sending of this IDoc will be restarted automatically as long as the
maximum repeat count is not exceeded.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message B1604 - No connection to SAP gateway (TXCOM destination &); see SAP system log ?

  The SAP error message B1604 indicates that there is no connection to the SAP gateway for a specified transaction communication (TXCOM) destination. This can occur for various reasons, and resolving it typically involves checking the configuration and connectivity of the SAP system. Here’s a breakdown of the potential causes, solutions, and related information:
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP application server and the SAP gateway.
  Gateway Configuration: The SAP gateway may not be properly configured or may not be running.
  Transaction Destination Issues: The specified TXCOM destination may not be correctly set up in the SAP system.
  Authorization Issues: The user may not have the necessary authorizations to access the gateway.
  System Load: High system load or resource constraints may prevent the gateway from processing requests.
  Firewall Settings: Firewalls or security settings may be blocking the connection to the SAP gateway.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or traceroute to verify that the SAP application server can reach the SAP gateway.
  Ensure that there are no network outages or issues.
  
  
  
  Verify Gateway Status:
  
  Check if the SAP gateway is running. You can do this by using transaction SMGW in the SAP GUI.
  If the gateway is not running, restart it.
  
  
  
  Review TXCOM Destination Configuration:
  
  Go to transaction SM59 to check the configuration of the RFC destination.
  Ensure that the destination is correctly defined and that the connection type is appropriate.
  
  
  
  Check System Logs:
  
  Use transaction SM21 to review the system log for any related error messages that might provide more context on the issue.
  
  
  
  User Authorizations:
  
  Ensure that the user has the necessary authorizations to access the gateway and the specified TXCOM destination.
  
  
  
  Monitor System Performance:
  
  Check for any performance issues on the SAP system that might be affecting the gateway's ability to process requests.
  
  
  
  Firewall and Security Settings:
  
  Ensure that any firewalls or security settings are configured to allow traffic to and from the SAP gateway.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Documentation: Review SAP documentation related to gateway configuration and troubleshooting.
  Support: If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance.
  
  By systematically checking these areas, you should be able to identify and resolve the cause of the B1604 error message.