If I turn off SSID broadcast at the router (a Draytek 2900) the connection drops within seconds. If I turn it back on, the connection is re-established.
I have seen various issues with this when initially configuring wifi networks (often it isn't possible to get things working unless SSID is initially enabled) but I haven't seen this behaviour on any client yet.
I realise it isn't a particularly worthwhile security feature...
Peter.
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