Game client cannot connect to game server

I have a VPS with a public IP of 52.26.76.224 and all of its ports are open.
This VPS is running game server built from unity that will manage up to 500 active users (This is made possible due to an extremely low send rate of only 3 per second.

I have a game client built from unity that I need to connect to the VPS on port 25001.

For some reason this isn't working....

Game client cannot connect to game server