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.