KT verifies that it's wifi connection is running by loading
"www.apple.com/library/test/success.html" every time the wifi is started.
If the KT cannot load it's test page, it says there was a connection error and wants me to choose a new access point.
So that may explain why the KT sometimes throws away the passphrase for an access point when trying to connect to Wifi: the access point connects but no response comes back from http://www.apple.com/library/test/success.html
within the required time.
Having details of the KT http client blithely handed off to Apple is bad enough, but having on occasion to re-enter the WPA2 passphrase again is highly annoying.
Is there no way to redirect the request from www.apple.com/library/test/success.html
to another http server, for example a local network server, to return a "success.html"? That would avoid the need to hack the KT with an http webserver.