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this post was submitted on 17 May 2024
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Can you ping the server from your phone successfully? You can use an app like this to check: https://play.google.com/store/apps/details?id=net.he.networktools
Making sure you have layer 3 connectivity first would be a good first step. If you don't, I would start by troubleshooting at layer 2. Run a packet capture on both your phone and server while trying to connect to determine where the disconnect is. Make sure ARP is resolving properly.
If layer 3 IS working, move up to layer 4 and make sure you are using the correct port, http vs https, etc
I installed the suggested he.net app. Sending its Ping from the phone (.106) returns no responses from the server (.137).
I've no idea about the rest of what you wrote, or how to test layer 2 or 3 specifically. I've no way to run a packet capture, that I know of. Thanks for trying in any case.