I followed the instructions on https://learn.microsoft.com/en-us/aspnet/core/host-and-deploy/linux-nginx?view=aspnetcore-5.0 to launch my ASP.NET Core website on Ubuntu. After successfully launching the site (as seen in the provided image), I encountered a problem where I was unable to access the site from outside. When I attempted to run telnet 12.34.57.78 5000, I received an error message stating that it failed to open a connection to the node.

I had previously opened port 5000 in VestaCP and confirmed that iptables -nvL outputted the line 143 8580 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:5000. However, despite these steps, I am still unable to access the site externally. What could be causing this issue?

To configure the server_name, you can set it as the IP address. It's important to note that if everything is properly set up, the server should be accessed externally on port 80 instead of 5000. To verify that the web server is listening on port 80 for external connections, the netstat command can be used. Simply enter "netstat -an | grep 80" and examine the output; it should appear similar to "tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN".

It's crucial to ensure that the firewall has the 80th port open in order to prevent any issues with external access.

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There could be several reasons why you are unable to access your ASP.NET Core website externally. Here are a few troubleshooting steps you can try:

1. Check if your ASP.NET Core application is listening on the correct IP address and port. You can use the `netstat` command to verify this. Run the following command: `netstat -tuln | grep LISTEN`. Look for the line that shows your application listening on port 5000.

2. Ensure that your application is binding to the correct IP address. Open your ASP.NET Core application's configuration file (usually `appsettings.json` or `appsettings.Production.json`) and check the `urls` setting. It should be set to `http://your-server-ip:5000`.

3. Double-check the firewall settings on your server. In addition to opening port 5000 in VestaCP and checking the output of `iptables -nvL`, you should also verify that there are no other firewalls blocking incoming connections. Disable any additional firewalls, such as UFW, if they are enabled.

4. Verify that your server's public IP address is correctly configured. If your server is behind a router or firewall, ensure that port forwarding is correctly set up to forward incoming connections on port 5000 to your server's internal IP address.

5. Check if Nginx or any other reverse proxy is running on your server. If you have set up Nginx as a reverse proxy for your ASP.NET Core application, make sure it is configured correctly and forwarding requests to the correct IP address and port.

6. Review your ASP.NET Core application's logs for any errors or issues. Check the logs folder of your application for any relevant error messages that could help identify the problem.

7. Check if there are any network-level restrictions or traffic filtering in place that might be preventing external access to port 5000. Contact your network administrator to ensure that there are no network policies or restrictions blocking incoming connections on that port.

8. Verify that your ISP is not blocking incoming connections on port 5000. Some Internet Service Providers (ISPs) restrict certain ports to prevent hosting services. Contact your ISP to confirm whether they are blocking incoming connections on port 5000.

9. Double-check the IP address you are using to access your ASP.NET Core website externally. Ensure that you are using the correct public IP address assigned to your server. You can use online tools like "What Is My IP" to verify your public IP address.

10. Test access to your ASP.NET Core website from a different network or location. This can help determine if the issue is specific to your current network or if it affects all external connections.

11. Restart your ASP.NET Core application and Nginx (if applicable). Sometimes, a simple restart can resolve connectivity issues.

12. If you have SSL/HTTPS configured for your ASP.NET Core website, make sure that the SSL certificate is valid and properly configured. SSL misconfigurations can sometimes prevent external access.