Port Forwarding: How to Check If Your Router/Firewall Ports are Open Correctly

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.

Questions or comments? Leave them below and as always, share this post on Facebook and Twitter

  1. John Brock

    The link http://www.canyouseeme.org given above does not work.

    That is not very helpful.

  2. POed

    Don’t work dude. Times out.

  3. steeve

    hello everybody!
    I’m steeve!
    I have a problem with port 80 ’cause my isp blocked it and i couldn’t access my computer from another pc on the internet. my router is a gobesurfer3 and i have already an no-ip account as bozikeli.no-ip.org!
    so please help to solve this prolem!

  4. SAM

    HI,how do i open ports correctly from my router, i asked my ISP, and they are not blocking the ports i need. i need port# 8000, 101, 6082. they are for my DVR.
    please help. i did open all these three ports from my cisco router but when i check it from the open port scanner, it still shows 101,8000 is blocked.but does show 6082 as open.
    please Advise

  5. Will Hernandez


    I use to access my NAS and other IP cam at home from the intenet / outside my LAN by using Synology NAS DS210j and TP-Link Router TL-MR3420 for more than a year.
    I set up my no-ip on my NAS, and set the NAS IP address on the DMZ zone of the router.

    UNTIL, my NAS harddisk have problem recently and I need to replace it with a new harddisk and reinstall NAS to it’s latest firmwire.

    AFTERThat, I can not access my NAS and IP Cam anymore by using my no-ip account. I can still access my NAS and IP Cam using 192.168.1.xxx format Gateway information from my NAS’s set up indicated my internal address is and my external address is 203.215.xxx.xx
    Which is different from the router WAN’s IP address is 100.77.xxx.xx

    I try to stop using my NAS DDNS service and set my no-ip account on the router, and it work on my LAN by using typing format xxxx.no-ip.info on my brower, but unable to reach it from the interent.

    I use canyouseeme.org to check all ports I am using, but I just receive the error message indicate as below
    “Error: I could not see your service on 203.215.xxx.xx on port (5000)
    Reason: Connection timed out”

    Do anyone know what is the problem on this?

    By the way, I have the similiar set up ( Dlink router w/ Synology NAS 209+II ) on my office with different ISP, and it work fine. The NAS’s extenal IP address is same as my Router WAN IP address. I can access my NAS and IP Cam from the interent. By using canyouseeme.org it inicate the ports are open.

    Hope you and the expert can give me advise and solution !

    • 203.215.xxx.xx, I need the full IP address and the ports that are necessary for remotely connecting to the IP camera and the Synology NAS DS210j. Basically if canyouseeme.org is telling you that it cannot see your service. That means that somehow your routers settings have been reset or, there may now be a firewall blocking access.

      I found a guide for port forwarding your particular router. Simply figure out what ports you need to forward and follow this guide. Your router looks rather simple to forward. http://noip.co/T8GTTj Let me know if you have any additional questions!

  6. Another tip:
    our company use one local server machine for some things. setting up a SVN server, I did found that port 443 (SSL, https connections) is usually blocked by ISPs. Just forward another external port to 443 and it should work.

  7. mahesh


    Cisco firewall in transparent mode.. we have server when i try send the email doesn’t reach the Destination. how to check the firewall block SMTP port . Please help me ..


  8. Prasad


    Disabling the firewall in the router is allowing me to access the forwaded ports.

    However I feel this is not a right way to do.

    Any other suggestion ??

  9. Dick

    It says port 80 is blocked. That is unlikely.

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