If everything else on your network is working fine, the inability to ping one important server may be mystifying and frustrating. IP conflicts are a common cause of such issues. Conflicts can result from static IPs, especially if there was a recent network change. Unplugging a suspect device to see if that resolves the problem is one way to confirm conflicts as the cause. Conflicts can also sometimes occur with dynamically assigned IP addresses, especially in high volume situations involving a constant flux of connected devices, as may happen in environments where many people are bringing their own device to work (BYOD). Regular IP address scans can help address such problems.