First reboot the iPad - hold down the on/off button (top left hand corner) and the home button (center of screen) until the screen goes black and the Apple logo appears. Then let go of both buttons and wait until the reboot is complete (a couple of minutes). Then try to acccess the site again.
If this doesn’t help then tap the Settings icon (grey gear icon), tap “General” then scroll down the left hand panel and tap “Safari” - then scroll down the right hand panel and tap “Clear History and Website Data.” You will have to re-enter your TOTV password.
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