internet connection issue and open ports

[lesliechu]

Hi,

This afternoon I was unable to log on to arlo app on my mobile phone. I was at home and then realized the internet led is solid amber. So I tried to reboot my modem router and after a few minutes the green led is back and I was able to log on to the arlo app.

I noted that the server connection requires port 80,443 and 123. However, none of them are open as I tested on http://www.canyouseeme.org/.

I have a customized port (e.g. 5125) which passed the same test so it looks like the port 80,443,123 are all blocked by my isp.

However, at the most of time my arlo cameras function properly. I can log on to the app to view live stream and the motion detection works as normal.

Does anyone think the ports are really important and why my cameras can still work as normal when the ports are blocked?

Thanks,

LC

[jguerdat · Accepted solution]

The ISP really can't block those ports since they are all widely used (80 is for http, 443 is for https and 123 is ntp for time sync).  However, they could block access to netgear.com for some reason but your normal operation indicates that isn't the case.

The port test your ran is likely to test for incoming packets which the firewall should rightfully block unless you're running a server of some sort.  Outgoing packets should be just fine unless you've set your router to block those for some security reason.

Thus, I think you're fine.  If the system ever works, nothing is specifically blocking it.

[lesliechu]

 thanks for  answering my  question.  I   understand  now.