Here are some options to resolve this issue:
1. Make sure that your Internet connection is stable at the moment when this error appears.
2. Look for the maintenance accouncements at our news section and on our forum.
3. Try resetting the TCP/IP stack.
4. Open the hosts file with a Windows Notepad. Make sure that all lines in this document marked as comments using a # sign before them. You can find the file here:
C:\Windows\System32\drivers\etc
If nothing mentioned above helps, please contact our Customer Support.