3021129 - Failed to login into ASE from AMC with error "java.net.ConnectException: Connection refused" - SAP ASE

• Unable to login into ASE from Administration and Management Console (AMC) web interface during the installation.
• The below is the errors noticed:

INFO 58827 --- [http-nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
INFO 58827 --- [http-nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
INFO 58827 --- [http-nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 10 ms
ERROR 58827 --- [http-nio-8080-exec-6] c.s.a.n.a.AuthenticationRepository       : Error in testConnection
INFO 58827 --- [http-nio-8080-exec-6] c.s.a.n.a.AuthenticationProcessor        : Login failed
ERROR 58827 --- [http-nio-8080-exec-6] c.s.a.n.AbstractApplicationProcessor     : DE:Unable to connect ASE server
com.sap.ase.nanna.ApplicationException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: JZ006: Caught IOException: java.net.ConnectException: Connection refused (Connection refused) (local port nn to address 0:0:0:0:0:0:0:0, remote port 4901 to address(nn) (server_name))

at com.sap.ase.nanna.authentication.AuthenticationRepository.testConnection(AuthenticationRepository.java:44) ~[classes!/:1.0-SNAPSHOT]
at com.sap.ase.nanna.authentication.AuthenticationRepository$$FastClassBySpringCGLIB$$cf90dce4.invoke(<generated>) ~[classes!/:1.0-SNAPSHOT]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) [spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]

#Name of the host machine where ASE and AMC.jar will run on. This value will be used to build the JDBC URL.
ase.host=<server_name>      
#Port to connect to ASE using JDBC.
ase.port=4901

• SAP Adaptive Server Enterprise (ASE) 16.0 SP04
• Administration and Management Console (AMC)
• SAP NetWeaver (All versions)

AMC,connection refused monitor monitoring admin , KBA , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , How To