How to clear cache on your iPhone or iPad in Safari
Why you might need to clear your cache
When you go to a DOD classified website, the website will ping the Safari browser for a certificate. Smart Card Utility will then supply your 9a Authentication certificate. However, if your cache in Safari hasn’t been cleared in a while, other certificates may be sent to the website ahead of Smart Card Utility. To prevent other certificates from being sent, you should clear your cache every so often.