We have one user on a network of around 50 people.
Around 12:15pm (give or take a minute or 2) one user on the network is denied access to sharepoint intranet site.
He is constantly requested to login to the site, and although his credentials are correct, he is refused access.
He has 3 different browers on his pc, (IE, Firefox and Chrome)... and they all are refused around this time.
The 'lockout' period can last anywhere from 10 minutes to an hour or 2. Restarting the pc makes no difference.
No other use is affected. It appears to be this one particular user on this one pc. If he logs on to another pc, access is fine.
However... if another user logs in to the 'affected' computer during this 'lockout' time they will be successfully able to login to sharepoint.
500 points for this as it's a bit of a head scratcher.