OBS says "Unable to connect to server", why?

[a63258873]

我的一台路由器上面有两台电脑，一台可以正常使用OBS，另一台不能正常使用OBS。
The above screenshot means "Connection failed", "Unable to connect to server"

 

[a63258873]

I have two computers on top of one router, one works fine with OBS and the other does not.