The credential storage password is a password to "protect" your saved wifi network passwords. When you log on to a wifi network, the phone saves the "credentials" of the network for later use, and protects them with the password. If you forget the password- or in your case it's simply unknown- enter any password until it threatens you with erasing all your credentials. Keep entering the passwords until it does erase everything (it WILL NOT affect your data). At that point it will ask you to enter a new one, do so and it will allow you to access your wifi. I did the same thing at my University.
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