A standard information required for diagnostics under ddos protection services while you got a problem.
Traceroute (Windows clients use 'tracert' and on Linux and OSX use 'traceroute')
1: Please provide a traceroute from a player or device that cannot connect to server (Player/Client => Server)
2: Please provide a traceroute from a server to players that connect to server (Server => Player/Client)
We need above information to verified your connecting to server are symmetric.
Netcat to Server (required additional install)
1: Please provide a netcat connect to server with application that your running follow procedures
nc -v [ip address] [port]
such as your server ip address is 30.30.30.30 and port is 49000 then use this command
nc -v 30.30.30.30 49000
We need above information to see the result of connection to server on specific port is work or not.