If your device isn't working properly, you can try several solutions to solve the problem. In most cases you can solve the problem by following these guidelines:
I can't use WLAN
Cause 4 of 6: A connection is rejected by a WLAN
If a connection is rejected by a WLAN, you can't access the Internet using WLAN. WLANs use different security settings. If you can't connect to a WLAN, you may need to change the security settings.
Solution: Contact the WLAN administrator to obtain the correct security settings.