it just keep shows below message only
There was an unexpected error with the login session. Please try again.
yes I tried but it still same error happens.
Then I think you should try to use other mudfish nodes with Full VPN mode enabled because it looks the game publisher blocked the public IP of mudfish nodes…
To solve this issue, it seems we need to lease more nodes at Vietnam.
then when can I get the new nodes and actually can use VPN service for my needs?
Let me take some times to find the good providers at VN area. 
I’ll update when I get any nodes.