One of the most common issues our new users have when setting up their No-IP account is port forwarding. Port Forwarding is a very simple task, but every router manufacturer does it differently, so for the best resource of information, you should check out your router manufacturer’s website for detailed information. You can check out this article if you are still having trouble:
A Lesson on Opening and Forwarding Ports on your Router
After you have successfully forwarded your ports, you will want to check to see if they are forwarded correctly. You can use this tool to see if your ports are open correctly: www.portchecktool.com.
This tool will check for open ports and see if there are any services responding on that port. It comes in handy when troubleshooting your network. Specifically, it helps in checking to see if your ISP blocks certain ports such as HTTP port 80 and SMTP port 25 (commonly blocked by major broadband residential ISPs).
Additionally, if those ports are blocked, No-IP has a solution that will get around this block. Users with ISPs that block the standard HTTP port can use the port 80 redirect feature available to all users. This can be found in the member section when managing your host. No-IP also offers Mail Reflector and Alternate-Port SMTP services for those with ISPs that block inbound and outbound SMTP port 25 respectively.
Keep in mind when using this tool you will need to open up the Port Check Tool website from the same WAN IP address that you wish to check for open ports.
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