How To Fix E0851 - IDoc transfer: Logon to R/2 System failed (no confirmation)

SAP Error Message - Details

• Message type: E = Error

• Message class: E0 - SAP EDI messages

• Message number: 851

• Message text: IDoc transfer: Logon to R/2 System failed (no confirmation)

What causes this issue?

The SAP system could not log on to the R/2 System. The confirmation from
the R/2 System was negative.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Returned data buffer in detail:
Log header : &v1&
Error number : &v2&
(possible use in R/2 table T100)
Error message (part 1) : &v3&
Error message (part 2) : &v4&

System Response

How to fix this error?

Test the CPI-C connection to the R/2 System.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E0851 - IDoc transfer: Logon to R/2 System failed (no confirmation) ?

  The SAP error message E0851 indicates that there was a failure in logging into the R/2 system during an IDoc transfer. This can occur for several reasons, and understanding the cause is essential for troubleshooting and resolving the issue.
  Causes:
  
  Incorrect Credentials: The user credentials (username/password) used for the connection to the R/2 system may be incorrect.
  Network Issues: There may be network connectivity problems between the SAP system and the R/2 system.
  R/2 System Down: The R/2 system may be down or not reachable at the time of the IDoc transfer.
  Configuration Issues: The RFC (Remote Function Call) destination configuration may be incorrect or not properly set up.
  Authorization Issues: The user may not have the necessary authorizations to log into the R/2 system.
  System Parameters: There may be system parameters or settings that are not correctly configured for IDoc processing.
  
  Solutions:
  
  Verify Credentials: Check the username and password used for the connection to ensure they are correct.
  Check Network Connectivity: Ensure that the network connection between the SAP system and the R/2 system is stable and functioning. You can use tools like ping or traceroute to test connectivity.
  Check R/2 System Status: Verify that the R/2 system is up and running. If it is down, you will need to bring it back online.
  Review RFC Destination: Go to transaction SM59 in the SAP system and check the configuration of the RFC destination that points to the R/2 system. Ensure that it is correctly configured and test the connection.
  Check Authorizations: Ensure that the user has the necessary authorizations to access the R/2 system. You may need to consult with your security team to verify this.
  Review System Parameters: Check the relevant system parameters in both the SAP and R/2 systems to ensure they are set correctly for IDoc processing.
  
  Related Information:
  
  Transaction Codes: 
  
  SM59: For managing RFC destinations.
  WE02: For monitoring IDocs.
  WE19: For testing IDoc processing.
  
  
  Logs: Check the application logs (transaction SLG1) for more detailed error messages that may provide additional context.
  Documentation: Refer to SAP Notes and documentation related to IDoc processing and RFC connections for further troubleshooting steps.
  
  If the issue persists after checking the above points, it may be beneficial to consult with your SAP Basis team or SAP support for further assistance.