How to solve "System.IO.IOException: 'Failed to bind to address https://localhost:." in .Net?

This error message suggests that an application or service is attempting to bind to a local network address on the HTTPS protocol, but the binding is failing due to an invalid address. The address provided in the error message is incomplete, which may be the root cause of the issue.

Here are a few steps you can take to troubleshoot this issue:

Verify the address: Ensure that the address being used in the application or service is complete and valid. The error message indicates that the address is incomplete, so you will need to determine the correct address to use. Make sure that the correct port number is specified as well.
Check for conflicting services: Verify that no other application or service is already bound to the specified network address and port. If another service is already using the specified address and port, you will need to either stop that service or choose a different address and/or port for your application or service.
Check firewall settings: If your application or service is running on a machine with a firewall, ensure that the firewall is configured to allow traffic to the specified network address and port. You may need to create a new firewall rule to allow traffic through.
Restart the service: Sometimes simply restarting the application or service that is generating the error can resolve the issue.

If none of these steps resolve the issue, you may need to seek additional support from the application vendor or a technical support team.

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