ahmedsa
You say the problem still exists.
Which problem ?
Do you mean inability to ping your site or inability to send/receive emails or something else ?
Please be specific & provide details.
It will also be useful to provide a sketch of your network layout & interconnectivity, showing all devices ie workstations, Servers, routers, modems, switches & anything else that might be there.
Also provide the LAN IP & netmask for each device & the workgroup or trusted DOMAIN name that each device is a member of.
Please take the time to tead this
http://www.chiark.greenend.org.uk/~sgtatham/bugs.html& when you have read it fully, come back here with a more structured & detailed approach to your answers.
.... and please DO NOT start a new thread on this issue, keep all information & answers in this one thread until the matter is fully resolved.
.... and try not to change settings anywhere unless instructed by someone in this thread, if you keep changing the goal posts it is hard to hit the target.