UIM - Unable to launch UMP portal

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

Have an issue to launch the UMP portal. Had to restart the wasp probe and after this was able to launch the UMP.
Need to know root cause of this issue 

Environment

Release : 8.51, 20.X

Component : UMP / data_engine

Resolution

In this particular scenario based on below error in ump wasp logs indicates database connection issues for ump portal

ce dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'reportOptionsSchedulingService' defined in ServletContext resource [/WEB-INF/applicationContext-report-options.xml]:
 ... 101 more
Caused by: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (The TCP/IP connection to the host localhost, port 1433 has failed. Error: "Connection refused: connect. Verify the connection properties, check that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port, and that no firewall is blocking TCP connections to the port.".)
 at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
 at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
 at org.apache.tomcat.dbcp.dbcp.BasicDa

After the database connection issues are resolved and wasp probe restarted ump access is successful again