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If a user chose wrong type of authentication (e.g. SSH key instead of password) then (s)he can not change it for the host in the wizard until IDE is restarted as it's stored somewhere and is not suggested to be changed any more. If user entered wrong path to SSH key then it's impossible to re-enter it either.
Fixed with http://hg.netbeans.org/cnd-main/rev/83c6881b7dac