Sympton
• In transaction code SMQ2, you received "XI Error JCO_COMMUNICATION_FAILURE.MAPPING: Queue error".
• When executing the RFC test connection on AI_RUNTIME_JCOSERVER, AI_VALIDATION_JCOSERVER, LCRSAPRFC and SAPSLDAPI, you received error " ERROR: program AI_RUNTIME_SID not registered".
Cause
At first, go for the logs file. From there, you'll find the specific root cause of the error. Normal caused are,
• Connection broken between ABAP and Java
• Out of memory / overload
• SAPJSF user
Solution
• Restart the XI Java engine
• Delete & recreate the JCO RFC destinations (need to restart the Java engine)
• Check the SAPJSF user authorizations, validity and password.
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