2723966 - Auto activity "Set Up Single Sign-On" failed due to "connect to SAP gateway failed" error

Automatic Activity "Set Up Single Sign-On" in Step 'Finalize Configuration' of 'Managed System Configuration' failed due to the following error messages.

"A failure occured while connecting to ABAP stack on <host> sys=<instance number> client=<client number> user=<user name>. Details : Connect to SAP gateway failedConnection parameters: TYPE=A DEST= ASHOST=<host> SYSNR=<instance number> PCS=1LOCATION CPIC (TCP/IP) on local host with UnicodeERROR partner '<host name>:<port number>' not reachedTIME <time and date>RELEASE 745COMPONENT NI (network interface)VERSION 40RC -10MODULE <Drive>:/depot/bas/745_REL/src/base/ni/nixxi.cppLINE 3375DETAIL NiPConnect2: <IP Address>:<Port number>SYSTEM CALL connectERRNO 10061ERRNO TEXT WSAECONNREFUSED: Connection refusedCOUNTER 7(cause=com.sap.mw.rfc.exceptions.RfcException Connect to SAP gateway failedConnection parameters: TYPE=A DEST= ASHOST=<host name> SYSNR=<instance number> PCS=1LOCATION CPIC (TCP/IP) on local host with UnicodeERROR partner '<host name>:<port number>' not reachedTIME Fri Nov 23 06:21:05 2018RELEASE 745COMPONENT NI (network interface)VERSION 40RC -10MODULE D:/depot/bas/745_REL/src/base/ni/nixxi.cppLINE 3375DETAIL NiPConnect2: <IP Address>:<Port number>SYSTEM CALL connectERRNO 10061ERRNO TEXT WSAECONNREFUSED: Connection refusedCOUNTER 7)

• SAP Solution Manager 7.2

KBA , SV-SMG-INS-CFG , Setup and Configuration of the Solution Manager system , Problem