Network Error ioexception: Connection refused: connect

Reference Original article http://blog.csdn.net/hil2000/article/details/6576908

After installing SQL server2012, configure the environment variables and report the error "org. apache. commons. DBCP. sqlnestedexception: cannot create poolableconnectionfactory (network error ioexception: Connection refused: Connect) ", carefully check the database connection class and connection pool configuration, no errors found, and then open the SQL Server Database Configuration tool, check that the TCP/IP in the Web configuration of SQL Server 2012 is disabled by default. Enable it instead! However, the SQL Server service must be restarted to take effect!