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

E0851 - Overview

• 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.
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