List of network ports needed for correct work game client.
If you have some problems with connection to server (data is not loaded in Port, exit to Open World is not working, empty chat or entering battles is not working) check that 7770, 8089, 5672, 5222, 8080, 21020-21036, 7401-7600 ports are available in your network and PC.
Checking network connection to game servers (using tracert)
Connection issues (login errors, random disconnects etc.) can be caused by problems with intermediate network providers between client machine and game servers. Connection can be tested using Windows tracert utility by the following steps:
Open Windows Command Prompt (press Windows + R and type cmd, press enter afterwards)
Type: tracert <server_address> and press enter (example: tracert 89.163.234.93)
Wait until command fully finishes. Presence of "*" as well as high values (300ms and more) in output result could be caused by problems with intermediate server. Note name of the server for corresponding line
You can copy results to clipboard by right-clicking on console -> Select All and pressing enter afterwards
Also could be useful to do regular ping to server, for this open Command Prompt and type: ping <server_address> -n 25 (example: ping 89.163.234.93 -n 25)