If it's not some sort of proxy/firewall remapping the port, you probably shouldn't use a port above 1000 for some services.
Consider this: an attacker (somehow) managed to get user access to your server. They can now dos the service until it crashes and then start their own service listening on that same port, maybe impersonating your service. Maybe they can use that to grab sensitive information or do something else.
Consider this: an attacker (somehow) managed to get user access to your server. They can now dos the service until it crashes and then start their own service listening on that same port, maybe impersonating your service. Maybe they can use that to grab sensitive information or do something else.