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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:

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.