Cannot initialize database connection from spring boot application - sql-server

Question

I am able to successfully connect to my local database, by specifying following URL in application.properties file of my spring boot application:
application.properties
spring.datasource.url=jdbc:sqlserver://localhost:1433;databaseName=mantaDB;integratedSecurity=true
And here is my output:
2019-Aug-29 11:14:41.298 INFO com.zaxxer.hikari.HikariDataSource - HikariPool-1 - Starting... -
2019-Aug-29 11:14:41.753 INFO com.zaxxer.hikari.HikariDataSource - HikariPool-1 - Start completed. -
2019-Aug-29 11:14:41.914 INFO o.h.jpa.internal.util.LogHelper - HHH000204: Processing PersistenceUnitInfo [_ name: default_ ...] -
2019-Aug-29 11:14:42.102 INFO org.hibernate.Version - HHH000412: Hibernate Core {5.3.7.Final} -
2019-Aug-29 11:14:42.396 INFO o.h.annotations.common.Version - HCANN000001: Hibernate Commons Annotations {5.0.4.Final} -
2019-Aug-29 11:14:42.827 INFO org.hibernate.dialect.Dialect - HHH000400: Using dialect: org.hibernate.dialect.SQLServerDialect -
2019-Aug-29 11:14:44.157 INFO o.s.o.j.LocalContainerEntityManagerFactoryBean - Initialized JPA EntityManagerFactory for persistence unit 'default' -
Now, I want to change application to point to my dev db box:
application.properties
spring.datasource.url=jdbc:sqlserver://STUDENT12.site,28001;databaseName=mantaDB;integratedSecurity=true
But, I am getting following error:
2019-Aug-29 11:16:48.089 INFO com.zaxxer.hikari.HikariDataSource - HikariPool-1 - Starting... -
2019-Aug-29 11:17:18.682 ERROR com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - Exception during pool initialization. -
com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host STUDENT12.site,28001, port 1433 has failed. Error: "STUDENT12.site,28001. 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:228)
at com.microsoft.sqlserver.jdbc.SQLServerException.ConvertConnectExceptionToSQLServerException(SQLServerException.java:285)
Clearly, I can get to the database.
Does anyone know what i am doing wrong?

Answer 1

The JDBC Url should look like:
jdbc:sqlserver://[serverName[\instanceName][:portNumber]][;property=value[;property=value]]
Building the Connection URL
And the error makes it clear that you are not connecting on port 28001:
connection to the host JD1LSTWLSLMC101.dcsr.site,28001, port 1433 has
failed
So
spring.datasource.url=jdbc:sqlserver://JD1LSTWLSLMC101.dcsr.site:28001; . . .