IMC数据库连接失败

 com.microsoft.sqlserver.jdbc.SQLServerException: 通过端口 1433 连接到主机 192.168.253.11 的 TCP/IP 连接失败。错误:“No buffer space available (maximum connections reached?): connect。请验证连接属性。确保 SQL Server 的实例正在主机上运行，且在此端口接受 TCP/IP 连接，还要确保防火墙没有阻止到此端口的 TCP 连接。”。 at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:190) at com.microsoft.sqlserver.jdbc.SQLServerException.ConvertConnectExceptionToSQLServerException(SQLServerException.java:241) at com.microsoft.sqlserver.jdbc.SocketFinder.findSocket(IOBuffer.java:2243) at com.microsoft.sqlserver.jdbc.TDSChannel.open(IOBuffer.java:491) at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1309) at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:991) at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:827) at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1012) at java.sql.DriverManager.getConnection(DriverManager.java:582)