Its written in most webpages now a days to either allow or not allow you to save login information and passwords.
The issue you are most likely seeing is that most browsers don't always honor it.
I believe all Aruba products have it set to not allow you to save login information because it makes it insecure practice. There are a lot of third party products out there that do allow you to override or auto fill the information for you. In the latest iOS 7 apple allows you to override that setting in safari.