I have a website which is not opening at my machine/network whether its working fine on another machines on different network and also working in proxy sites .
Can anyone assist what is the issue as I have linux hosting with Cpanel .
If the domain is working fine at other places , it may possible that your local ISP IP address is got blocked in Server firewall . Its possible due to various reasons like Wrong login attempts for Cpanel or FTP of that domain on server.
For that please update you local ISP IP address to you Server administrator (hosting provider) , so that they can check and remove your IP from server firewall.
If you have any dedicated IP with your ISP you can ask your hosting provider to White list you IP on firewall to avoid such issues .