Ambleman ( Geoff ) found the way to get around this one here's what you do
"I logged in as a guest and clicked on "members list". Denied access and asked to log in via box. Did that and got straight in. Logged out, then tried with usual shortcut icon on my desktop. Straight in no bother. Hope that has sorted the problem!!!"
Another thing to try is to click on "Start" then "Run"
Copy and paste the following into the box : ipconfig /flushdns
Click OK , restart your PC and that should fix it along with the above.