Socket.io expert consultant — 2

We built a message system with socket. It’s working very fine on 2 sub domains servers stage and developers server.
However, if android Java and iOS swift connect the code to the main domain server which is production server the socket doesn’t work and the log is showing just a continuous connection.
Our platform is using cloudflare where dns is hosted, we have bypassed cloudflare proxy yet nothing changed. We have created port 3000 on firewall which is the default port for node which is where socket.io is running yet is not socket is not working. The last push we did was to move Switch development server to production yet the couldn’t work the dsn and db changed.
However, in production server socket is working fine for web desktop and web mobile. So something is blocking connection on the main domain.