Fail to add Github account, [Connection Timed Out: getsockopt]

I tried to login in my Github account on IDEA, setting with no proxy, connection testing to github.com is successful, and I am able to clone my repo to my local by using http url directly.

But some how I just cannot login my account there, it shows the error message on both [Login In via Github] and the token way.

It has stuck me for several days, I tried to search the error code but all the result I can get is about MineCraft, and I'm still looking for the solution. 

If you have any idea about this issue, please leave your advice here, thank you.