In the first case, see if the WiFi is not turned on. 1, click the network icon in the lower right corner of the desktop, and then the WiFi appears, click it, open, and then search for wireless network, or there is a WiFi switch on both sides of the computer, open it.
2, or right click the network icon in the lower right corner of the desktop, open the network sharing center, change the adapter Settings, right click the wireless network, enable it, open the WiFi and reconnect to try it.
In the second case, the connection is limited requires a password to log in, if there is a password, open the browser, it will appear the login interface, enter the password and account on your own. If you don't have a password and account, you usually can't log in.
An exclamation mark means the phone is connected to wifi but has no Internet access. If only your device does not work, suggestions: 1. Use your own browser to log in to the web page and observe whether the link can be opened normally.
2. If a certain networking software is unavailable, check whether the function of preventing certain applications from using WLAN is configured. Actions: Settings -(More connection Settings)- Traffic Monitor - Manage application traffic...