ERR Connecting Time Out on SOME domains hosted by Sentora on my domain.

[kinjo]

i'm getting ERR_CONNECTION_TIMED_OUT 

Here’s the mail I got recently
This webpage is not available
Google Chrome could not load the webpage because www.youtube.com took too long to respond. The website may be down, or you may be experiencing issues with your Internet connection.
Here are some suggestions:

• Reload this webpage later.
  
• Check your Internet connection. Restart any router, modem, or other network devices you may be using.
  
• Add Google Chrome as a permitted program in your firewall's or antivirus software's settings. If it is already a permitted program, try deleting it from the list of permitted programs and adding it again.
  
• If you use a proxy server, check your proxy settings or contact your network administrator to make sure the proxy server is working. If you don't believe you should be using a proxy server, adjust your proxy settings: Go to the Chrome menu >Settings > Show advanced settings... > Change proxy settings... > LAN Settings and deselect the "Use a proxy server for your LAN" checkbox.
  

         
 Error 7 (net::ERR_CONNECTION_TIMED_OUT): The operation timed out.
I have windows internet explorer 8.
I didn't use it long time ago , now when try to enter it , it displays blank page and page is constantly crushing and recovering ''This tab has been recovered. A problem with this webpage caused internet explorer to close and reopen the tab.'' And then it's not responding so,i cant go to options or anything like that.
Now methods
In 1st method when i click on ''fix this problem'' link ,the same thing happens as when i try to connect to YT.
In 2nd method when i ran regsvr32 mshtml.dll‏ ,i get message ''mshtml.dll was loaded, but the DllRegisterServer entry point was not found. This file can not be registered.''
and when i ran regsvr32 msjava.dll‏,i get message ''LoadLibrary(''msjava.dll'') failed - The specified module could not be found.