How to resolve "curl: (7) Failed to connect to <hostname> port <port>: Connection refused" error?

To resolve the “curl: (7) Failed to connect to \ port \: Connection refused” error, you need to troubleshoot the underlying cause of the connection failure. Here are some steps you can take:

1. Verify that the hostname and port number are correct. Double-check the hostname and port number you are trying to connect to and make sure they are correct.
2. Check if the remote server is running. The connection may be refused if the server is not running or has crashed. Verify that the server is running and listening on the specified port.
3. Check for network issues. The error may be due to a network issue, such as a firewall blocking the connection. Check your network settings and firewall rules to make sure the port is open and accessible.
4. Try to connect using a different protocol. If you are connecting using a specific protocol (e.g. HTTP), try using a different protocol (e.g. HTTPS).
5. Try using a different tool. If you are still having trouble, try using a different tool to connect to the server, such as Telnet or Netcat, and see if you are able to establish a connection. This can help you narrow down the underlying cause of the issue.

Overall, the steps you take to resolve the error will depend on the specific situation and underlying cause of the connection failure.