Dracula

Yeah, totally made sense! I can see the connection been interrupted and in progress. Thanks! I'll post it here once I have done!

Problem solved!
Thanks to @Stolao and @Dastgir !
 
If you encounter a problem such like this or anything problem related to the rA Emu. Direct go to this link (CLICK ME) and ask for help in there. For sure they will helped you out with your problem.
 
Okay this is what they've told me to do :-
 
 
1 : char_athena.conf
// Login Server IP // The character server connects to the login server using this IP address. // NOTE: This is useful when you are running behind a firewall or are on // a machine with multiple interfaces. login_ip: VPS WAN-IP Changed TO 127.0.0.1 // The character server listens on the interface with this IP address. // NOTE: This allows you to run multiple servers on multiple interfaces // while using the same ports for each server. //bind_ip: 127.0.0.1 // Login Server Port login_port: 6900 // Character Server IP // The IP address which clients will use to connect. // Set this to what your server's public IP address is. char_ip: VPS WAN-IP < Stick with WAN-IP // Character Server Port char_port: 6121 2 : map_athena.conf
// Character Server IP // The map server connects to the character server using this IP address. // NOTE: This is useful when you are running behind a firewall or are on // a machine with multiple interfaces. char_ip: VPS WAN-IP Changed TO 127.0.0.1 // The map server listens on the interface with this IP address. // NOTE: This allows you to run multiple servers on multiple interfaces // while using the same ports for each server. //bind_ip: 127.0.0.1 // Character Server Port char_port: 6121 // Map Server IP // The IP address which clients will use to connect. // Set this to what your server's public IP address is. map_ip: VPS WAN-IP < Stick with WAN-IP // Map Server Port map_port: 5121 3 : subnet_athena.conf
// Subnet support file // Format is: // subnet: net-submask:char_ip:map_ip // you can add more than one subnet (max 16) // check is if((net-submask & char_ip ) == (net-submask & servip)) => ok subnet: 255.0.0.0:VPS WAN-IP:VPS WAN-IP Changed TO subnet: 255.255.255.0:WAN-IP:WAN-IP 4 : inter_athena.conf
// MySQL Login server login_server_ip: 127.0.0.1 login_server_port: 3306 login_server_id: Everything-remain-the-same login_server_pw: Everything-remain-the-same login_server_db: Everything-remain-the-same login_codepage: login_case_sensitive: no ipban_db_ip: 127.0.0.1 ipban_db_port: 3306 ipban_db_id: Everything-remain-the-same ipban_db_pw: Everything-remain-the-same ipban_db_db: Everything-remain-the-same ipban_codepage: // MySQL Character server char_server_ip: 127.0.0.1 char_server_port: 3306 char_server_id: Everything-remain-the-same char_server_pw: Everything-remain-the-same char_server_db: Everything-remain-the-same // MySQL Map Server map_server_ip: 127.0.0.1 map_server_port: 3306 map_server_id: Everything-remain-the-same map_server_pw: Everything-remain-the-same map_server_db: Everything-remain-the-same // MySQL Log Database log_db_ip: 127.0.0.1 log_db_port: 3306 log_db_id: Everything-remain-the-same log_db_pw: Everything-remain-the-same log_db_db: Everything-remain-the-same log_codepage: log_login_db: loginlog If your port can't be detect, do check your VPS Firewall. In my case, I just change Source filter from IP Ranges to Allow from any source (0.0.0.0/0) and of course you have to add the port in Firewall rules to make it available for you to connecting it. 
 

 
You also can check your port is being close/open at this link (CLICK ME). Just if your case same like mine so this post will be useful for you. 
 
Thanks all of you. 

Yep, i'm one of users who use Google Cloud. What about it you want to know? 
 
Until now, I'm not facing any problem since the users can create and delete the project that they created. I recommended you to use the Trial they provide. You just pay it for a Dollar and they give you 60 days for the Trial. 
 
In your account, you will be credited 300$ as a fund to use inside Google Cloud. They have many specification of hardware and you can choose any one of it. For my project, I'm using a minimum specs that meets rAthena Emulator requirements to make it on-line.
 
One important thing is (for me), users can choose their desire network location. I'm taking an Asian region as my network location. It will make perfect connection for people around Asia. A low ping and smooth connection, that is what gamers and developers need. 
 
That's all. Anything else? Try to explore it more.
 
Good luck.

Yeah, totally made sense! I can see the connection been interrupted and in progress. Thanks! I'll post it here once I have done!

Problem solved!
Thanks to @Stolao and @Dastgir !
 
If you encounter a problem such like this or anything problem related to the rA Emu. Direct go to this link (CLICK ME) and ask for help in there. For sure they will helped you out with your problem.
 
Okay this is what they've told me to do :-
 
 
1 : char_athena.conf
// Login Server IP // The character server connects to the login server using this IP address. // NOTE: This is useful when you are running behind a firewall or are on // a machine with multiple interfaces. login_ip: VPS WAN-IP Changed TO 127.0.0.1 // The character server listens on the interface with this IP address. // NOTE: This allows you to run multiple servers on multiple interfaces // while using the same ports for each server. //bind_ip: 127.0.0.1 // Login Server Port login_port: 6900 // Character Server IP // The IP address which clients will use to connect. // Set this to what your server's public IP address is. char_ip: VPS WAN-IP < Stick with WAN-IP // Character Server Port char_port: 6121 2 : map_athena.conf
// Character Server IP // The map server connects to the character server using this IP address. // NOTE: This is useful when you are running behind a firewall or are on // a machine with multiple interfaces. char_ip: VPS WAN-IP Changed TO 127.0.0.1 // The map server listens on the interface with this IP address. // NOTE: This allows you to run multiple servers on multiple interfaces // while using the same ports for each server. //bind_ip: 127.0.0.1 // Character Server Port char_port: 6121 // Map Server IP // The IP address which clients will use to connect. // Set this to what your server's public IP address is. map_ip: VPS WAN-IP < Stick with WAN-IP // Map Server Port map_port: 5121 3 : subnet_athena.conf
// Subnet support file // Format is: // subnet: net-submask:char_ip:map_ip // you can add more than one subnet (max 16) // check is if((net-submask & char_ip ) == (net-submask & servip)) => ok subnet: 255.0.0.0:VPS WAN-IP:VPS WAN-IP Changed TO subnet: 255.255.255.0:WAN-IP:WAN-IP 4 : inter_athena.conf
// MySQL Login server login_server_ip: 127.0.0.1 login_server_port: 3306 login_server_id: Everything-remain-the-same login_server_pw: Everything-remain-the-same login_server_db: Everything-remain-the-same login_codepage: login_case_sensitive: no ipban_db_ip: 127.0.0.1 ipban_db_port: 3306 ipban_db_id: Everything-remain-the-same ipban_db_pw: Everything-remain-the-same ipban_db_db: Everything-remain-the-same ipban_codepage: // MySQL Character server char_server_ip: 127.0.0.1 char_server_port: 3306 char_server_id: Everything-remain-the-same char_server_pw: Everything-remain-the-same char_server_db: Everything-remain-the-same // MySQL Map Server map_server_ip: 127.0.0.1 map_server_port: 3306 map_server_id: Everything-remain-the-same map_server_pw: Everything-remain-the-same map_server_db: Everything-remain-the-same // MySQL Log Database log_db_ip: 127.0.0.1 log_db_port: 3306 log_db_id: Everything-remain-the-same log_db_pw: Everything-remain-the-same log_db_db: Everything-remain-the-same log_codepage: log_login_db: loginlog If your port can't be detect, do check your VPS Firewall. In my case, I just change Source filter from IP Ranges to Allow from any source (0.0.0.0/0) and of course you have to add the port in Firewall rules to make it available for you to connecting it. 
 

 
You also can check your port is being close/open at this link (CLICK ME). Just if your case same like mine so this post will be useful for you. 
 
Thanks all of you.