1938714 - [SLD] ERROR: timeout during allocate of registered program

RFC connections to the SLD (e.g. SLD_UC, SLD_NUC, SAPSLDAPI) results error message:

Connection Error
Error when opening an RFC connection (CPIC-CALL: 'ThSAPOCMINIT' : cmRc=27 thRc=6
ERROR: timeout during allocate of registered program
LOCATION: SAP-Gateway on host <hostname> / <port>
DETAIL: TP SLD_UC init/busy for more than 60 sec
COMPONENT: SAP-Gateway
COUNTER:
MODULE: gwr3cpic.c
LINE:
RETURN CODE: 677
SUBRC: 0
RELEASE:
TIME:
VERSION: 2

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• Up to SAP NetWeaver release 7.40
• System Landscape Directory (SLD)

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Fehler beim Öffnen einer RFC-Verbindung, SMGW, disconnecting, Protocol: Registered communication, has_deallocated, REG_COMMUNICATION, [UP] Local processing, queue size: 100, MaxQueueSize , KBA , BC-CCM-SLD , System Landscape Directory / Component Repository , BC-MID-RFC , RFC , BC-MID-CON-JCO , Java-Connector , BC-CST-GW , Gateway/CPIC , BC-CCM-SLD-JAV , System Landscape Directory Java Client & Server , BC-CCM-SLD-ABA , System Landscape Directory ABAP Connectivity , Problem