Cannot access my app on port non-standard (on a dropplet)

Hello, I wanted to know if this was normal or not. I have a nginx server on port 64297 and can’t access it from my computer navigator. I can access apps on port 80 or 443 wihtout any problem. I did all the networking rules, and I’m sure it works since I can access it from another droplet in the same private network. Does anyone already experienced this or have an idea on how to solve it ? (I can’t change port 64297, all the standard port are already taken). I can provide further informations if needed.