Egress block on port > 1024

Hey folks,
Using GL-MT3000. So some day I suddenly found the cloudflare tunnel in my NAS is not working. After some research I realized the required 7844 port is probably not working. Then I sshed into the router and tried
nc -zv portquiz.net [PORT]

The port works up to 1024 (1024 included) which is kind of weird... I mean there is the concept that ports below 1023 are privileged ports. Am i missing some settings? I did a factory reset and this persists.

Could you please try connecting the MT3000 to your mobile phone’s hotspot for internet access and check if the problem still occurs?

From what we see, this issue looks more like your internet service provider may be blocking access to higher-numbered ports.

Yes, hotspot works so mostly likely isp blocking ports. Interestingly, if i connect to the wifi from my apartment complex directly higher ports still works. Anyways, shoudn't be an issue with the router itself.

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