How To Fix TG236 - RFC logon failed with code &

SAP Error Message - Details

• Message type: E = Error

• Message class: TG - Messages for Upgrade Repository Switch

• Message number: 236

• Message text: RFC logon failed with code &

What causes this issue?

There are various reasons why an RFC connection could not be set up by
an external program (here "R3up"):
The DDIC password is not correct (message "not authorized")
The logon language is not supported (R3up: system language)
The host name of the application server is not known to the gateway
The gateway addressed (= gateway host plus gateway service) does not
exist, is not running, cannot be reached.

System Response

Return code -1 stands for a failed RFC logon. Return code -6 only
occurs if there is a memory bottleneck when an internal table is
created.

How to fix this error?

For return code -1, check the parameters entered. The working directory
(this is the tmp subdirectory for R3up) contains a trace file "dev_rfc"
with information about the error. If the trace is not detailed enough,
use the following traces as well:
In the environment of the process, set "CPIC_TRACE=2".
Also set the system trace (profile parameter rdisp/trace) to "2".
Activate the trace in the gateway (R3up: RfcTrace=ON in R3up.par)
If the return code is -6, stop all processes not required or increase
the virtual memory available by extending the swap space.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TG236 - RFC logon failed with code & ?

  The SAP error message TG236, which indicates "RFC logon failed with code &," typically occurs when there is an issue with the Remote Function Call (RFC) connection to an SAP system. The error code that follows the message can provide more specific information about the nature of the failure.
  Common Causes:
  
  Incorrect Credentials: The username or password used for the RFC connection may be incorrect.
  User Lockout: The user account may be locked due to multiple failed login attempts.
  Expired Password: The password for the user may have expired and needs to be reset.
  Network Issues: There may be network connectivity issues preventing the connection to the SAP system.
  Authorization Issues: The user may not have the necessary authorizations to log in to the target system.
  System Configuration: The RFC destination may not be configured correctly in the SAP system.
  SAP System Down: The target SAP system may be down or not reachable.
  
  Solutions:
  
  Check Credentials: Verify that the username and password are correct. If necessary, reset the password.
  Unlock User Account: If the user account is locked, unlock it using transaction code SU01 or contact your SAP administrator.
  Reset Password: If the password has expired, reset it using transaction code SU01.
  Test Network Connectivity: Ensure that there are no network issues preventing access to the SAP system. You can use tools like ping or telnet to check connectivity.
  Review Authorizations: Ensure that the user has the necessary authorizations to log in to the target system. This can be checked in transaction SU01.
  Check RFC Destination: Verify the configuration of the RFC destination in transaction SM59. Ensure that the connection parameters are correct.
  Check SAP System Status: Ensure that the target SAP system is up and running. You can check this through the SAP GUI or by contacting your system administrator.
  
  Related Information:
  
  Transaction Codes:
  
  SU01: User Maintenance
  SM59: RFC Destinations
  SM21: System Log
  ST22: Dump Analysis
  
  
  Logs: Check the system logs (transaction SM21) for any additional error messages that may provide more context.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific error codes related to TG236.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or SAP support for further assistance.