Using Rad Studio (Delphi) 10.3.2, I have a TCPServer app on my local PC and created an app running on an Android phone to connect using the local IP address, but I get "Connect timed out". Both are connected to the same local network via 192.168.1.x range addresses. I can ping the phone device from my PC. I can connect to the TCPServer from another Windows PC on the network, so that's working.
I don't understand what could be getting in the way. Is there something in Android preventing connections to a local IP address? I have the Android Manifest for my app allowing INTERNET access but not sure if there is another one for accessing the local network.
I also tried connecting from the phones Chrome browser but nothing arrives at all at the TCP Server.
It turns out it was caused by the 1.1.1.1 DNS app that I had installed on the phone. Disable that and then local IP connections are possible.