yaoyao123 Sorry, Spinebot's answer was way off the mark and has been deleted.
We have recently received many inquiries from other Chinese users with similar problems.
Please refer to the following thread for more information on this issue:
https://esotericsoftware.com/forum/d/28068-authenication-failed/3
As described there, this problem is not caused by our server, but by connection denials from users, so we can only guess at the cause of the problem. Since we see many users in China experiencing this problem, it may be that the security of the network is affected by area or other broader network security rather than personal settings. I hope an effective solution can be found.
