JDBCConnectionException : Unable to acquire JDBC Connection ? here is the quick fix

Could not open JPA EntityManager for transaction ? nested exception is javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection. Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host rdsql. .digital, port 2673 has failed ?.

1. org.springframework.transaction.CannotCreateTransactionException
2. javax.persistence.PersistenceException
3. com.microsoft.sqlserver.jdbc.SQLServerException
4. org.hibernate.exception.JDBCConnectionException

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org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
	at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:431) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373) ~[spring-tx-4.3.8.RELEASE.jar:4.3.8.RELEASE]
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130) ~[spring-tx-4.3.8.RELEASE.jar:4.3.8.RELEASE]
	at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45) ~[activiti-spring-5.22.0.jar:5.22.0]
	at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:31) ~[activiti-engine-5.22.0.jar:5.22.0]
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:40) ~[activiti-engine-5.22.0.jar:5.22.0]
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:35) ~[activiti-engine-5.22.0.jar:5.22.0]
	at org.activiti.engine.impl.asyncexecutor.AcquireAsyncJobsDueRunnable.run(AcquireAsyncJobsDueRunnable.java:52) ~[activiti-engine-5.22.0.jar:5.22.0]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_301]
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1692) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1602) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:1700) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:48) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
	at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:189) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
	at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:380) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
	... 8 common frames omitted
Caused by: org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
	at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:115) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:95) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:90) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getPhysicalConnection(LogicalConnectionManagedImpl.java:112) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getConnectionForTransactionManagement(LogicalConnectionManagedImpl.java:230) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.begin(LogicalConnectionManagedImpl.java:237) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.begin(JdbcResourceLocalTransactionCoordinatorImpl.java:214) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:52) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1512) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:45) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
	... 10 common frames omitted
Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host rdsql. .digital, port 2673 has failed. Error: "rdsql. .digital. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.".
	at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:206) ~[mssql-jdbc-6.1.0.jre7.jar:na]
	at com.microsoft.sqlserver.jdbc.SQLServerException.ConvertConnectExceptionToSQLServerException(SQLServerException.java:257) ~[mssql-jdbc-6.1.0.jre7.jar:na]
	at com.microsoft.sqlserver.jdbc.SocketFinder.findSocket(IOBuffer.java:2385) ~[mssql-jdbc-6.1.0.jre7.jar:na]
	at com.microsoft.sqlserver.jdbc.TDSChannel.open(IOBuffer.java:567) ~[mssql-jdbc-6.1.0.jre7.jar:na]
	at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1955) ~[mssql-jdbc-6.1.0.jre7.jar:na]
	at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:1616) ~[mssql-jdbc-6.1.0.jre7.jar:na]
	at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:1447) ~[mssql-jdbc-6.1.0.jre7.jar:na]
	at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:788) ~[mssql-jdbc-6.1.0.jre7.jar:na]
	at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1187) ~[mssql-jdbc-6.1.0.jre7.jar:na]
	at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:310) ~[tomcat-jdbc-8.5.14.jar:na]
	at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:203) ~[tomcat-jdbc-8.5.14.jar:na]
	at org.apache.tomcat.jdbc.pool.PooledConnection.reconnect(PooledConnection.java:361) ~[tomcat-jdbc-8.5.14.jar:na]
	at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:821) ~[tomcat-jdbc-8.5.14.jar:na]
	at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:651) ~[tomcat-jdbc-8.5.14.jar:na]
	at org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection(ConnectionPool.java:198) ~[tomcat-jdbc-8.5.14.jar:na]
	at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:132) ~[tomcat-jdbc-8.5.14.jar:na]
	at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:386) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:87) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	... 17 common frames omitted

		

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