This message on my Samsung:

 wifi-warning.jpg You have insufficient rights to see the content.

Wi-Fi Security Alert Suspicious activity has been detected on the current Wi-Fi network ("SSID") 
Disconnecting from this network is recommended. If you trust this network, you can add it as an exception so you won't see this warning again.

What does it mean? If I trust the network then surely misbehaviour is still a concern so why wouldn't I want to be told?
Is it actually detecting dodgy traffic or what? What causes this message exactly?