Network error IOException: Connection refused: connect

"Network error IOException: Connection refused: connect"错误是由jTDS在无法连接到服务器时抛出的异常。可能有几个原因导致这种情况发生：
1. 服务器名称拼写错误或端口号不正确。
2. SQL Server没有配置为使用TCP/IP。您可以通过SQL Server的网络实用程序应用程序启用TCP/IP，或者让jTDS通过命名管道连接（有关如何执行此操作的信息，请参阅URL格式）。
3. 服务器上有防火墙阻止端口1433。

如果您遇到此问题，请确保服务器名称和端口号正确，并检查服务器是否配置为使用TCP/IP。如果需要，您还可以尝试通过命名管道连接。如果服务器上有防火墙，请确保允许使用端口1433进行连接。

相关问题

sqlserver Network error lOException: Connection refused: connect

引用\[1\]中提到了一些可能导致"java.sql.SQLException: Network error IOException: Connection refused: connect"错误的原因和解决方法。首先，需要确保SQL Server服务器已经启动，并且1433端口已经打开。可以通过控制面板和telnet命令来确认。其次，需要打开1433端口，可以通过SQL Server的管理配置器来进行设置。最后，重启SQL Server服务器。这些步骤可以帮助解决该错误。引用\[2\]中也提到了类似的解决方法，包括启用Telnet客户端和重启SQL Server服务。请按照这些步骤逐一尝试解决问题。
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java java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is: java.net.ConnectException: Connection refused: connect]

This error message indicates that there was an issue with connecting to a remote Java RMI server. The error is caused by a connection failure, which prevents the client from retrieving the remote stub for the RMI server.

The most likely cause of this error is that the RMI server is not running or is not accessible from the client. It's also possible that there is a firewall or network configuration issue that is preventing the client from connecting to the server.

To troubleshoot this error, you can try the following steps:

1. Verify that the RMI server is running and accessible from the client. Check that the server is listening on the correct port and that there are no network issues that could be preventing the client from connecting.

2. Check the firewall settings to ensure that the required ports are open for RMI communication.

3. Verify that the naming service is running and that the RMI server is registered correctly with the naming service.

4. Check the server logs to see if there are any error messages that could provide more information about the cause of the connection failure.

5. If all else fails, try restarting the RMI server and the client to see if that resolves the issue.

If none of these steps solve the problem, you may need to consult the Java RMI documentation or seek assistance from a Java developer or system administrator.