Hello,
Try to do those steps:
How to clear your DNS cache
The following methods allow you to remove old and inaccurate DNS information that may result in 404 errors.
Windows® XP, 2000, Vista, 7, 8
Click the Start button.
On the Start menu, click Run....
If you do not see the Run command in Vista, enter "run" in the Search bar.
Type the following in the Run text box: ipconfig /flushdns
From there on your connection should work to our server. If still doesn't work it's probably your internet provider or firewall. Check firstly the firewall and make sure it allows file mu.exe and main.exe
If you don't know how to do it, add me to skype: wrathbinge
And i will be glad yo help you .