Generally speaking, it's a network problem, so you can't log in. If it is a wireless network, switch to mobile phone traffic. If it's mobile phone traffic, change to a wireless network. If you still can't log in, you can exit the background, clear the data and log in again.

Yongfeng International is the trading platform for the core financial derivatives of Hong Kong Rong Financing Investment Inc Group, the largest integrated financial online exchange in the Asia-Pacific region. It is a member of the Hong Kong Securities and Futures Association (HKFA registration number 03500 17) and is supervised by the Australian Securities Investment Management Committee (ASIC registration number 125830738).