How to resolve issues with accessing nginx reverse proxy?

There could be multiple reasons for the issue of not being able to access the nginx reverse proxy. Below are some possible solutions to resolve the problem.

1. Check if the target server is running properly: try to directly access the target server to ensure it can respond to requests. If the target server cannot be accessed, it may be due to a server malfunction or failure to start properly.
2. Check the nginx configuration file to ensure that it is properly configured for reverse proxy. Pay special attention to make sure the proxy_pass directive correctly points to the address and port of the target server.
3. Check the firewall settings: If the target server is running in a restricted network environment, it may be necessary to configure firewall rules to allow the nginx server to access the target server.
4. Check DNS resolution: If the domain name of the target server has changed, it may be necessary to update the domain resolution information in the nginx configuration file.
5. Check the network connection by testing the connection to the target server using the ping command. If the ping command cannot access the target server, it may be a network connectivity issue.
6. Check the nginx logs: Look at the nginx error log file, which is usually located in /var/log/nginx/error.log. The log file may contain detailed error information about issues with accessibility, which can help in troubleshooting.

If the above solutions don’t work, it may be necessary to further examine the network and server configurations, or contact the system administrator or network provider for more assistance.