2964024 - RFC connection failing with "Error when opening an RFC connection (Internal error)."

• For TCP/IP type RFC destination, connection test failed with Error when opening an RFC connection (Internal error).

AND 

• In dev_rfc* trace, there is below error:

  **** Trace file opened at XXXXXX 154722 +08, by disp+work
  **** Versions SAP-REL XXX,0,201 RFC-VER U 3 1847707 MT-SL
  RFC> AssertionTicket create failure
  >>>> [2] <RFC destination name> : TCP <ac: 1> K %%RFCSERVER%% >>> CLOSE /bas/XXX_REL/src/krn/rfc/abrfcio.c XXX(N)
  ==== Delta HO 0, 0 LOG DROPPED
  >>>> [2] <RFC destination name>: TCP <ac: 2> K %%RFCSERVER%% >>> FREE /bas/XXX_REL/src/krn/rfc/abrfcio.c XXX (#)
  ==== Delta HO 0, 0 LOG DROPPED

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

• SAP NetWeaver
• SAP Web Application Server for SAP S/4 HANA
• ABAP PLATFORM - Application Server ABAP

RFC connection failed, RFC destination, SM59, JCO connection, Do Not Send Logon Ticket, Logon & Security tab, AssertionTicket create failure, Delta HO 0, 0 LOG DROPPED, RFC, RFC_GDPR , KBA , BC-MID-RFC , RFC , Problem