HT4623 how do you clear a 404 error when trying to go to a secure site

Question

Wife and I both have ipads, had to have internet support, (rural area,small provider) to be able to connect,tech disabled security(don't know if it was on router or my ipad, but wife can get on banking sites and mine comes up as "HTTP Error 404 Not found" on 1 secure website and "Server Error '/ ' Application.   Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster." on the other secure website. Has anyone else encountered this problem and know how to fix it? We are at least 60 miles from the nearest Apple repair shop.

Answer 1

Many site issues can be caused by corrupt cookies or cache.
* Clear the Cache and
* Remove Cookies<br> '''''Warning ! ! '' This will log you out of sites you're logged in to.'''
Type '''about:preferences'''<Enter> in the address bar.
* '''Cookies;''' Select '''Privacy.''' Under '''History,''' select Firefox will '''Use Custom Settings.''' Press the button on the right side called '''Show Cookies.''' Use the search bar to look for the site. Note; There may be more than one entry. Remove '''All''' of them.
* '''Cache;''' Select '''Advanced > Network.''' Across from '''Cached Web Content,''' Press '''Clear Now.'''
If there is still a problem,
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
While you are in safe mode;
Type '''about:preferences#advanced'''<Enter> in the address bar.
Under '''Advanced,''' Select '''General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites. Are there any problems?
Then restart.