I have a client that last Thursday a handful of their computers in the office started giving them errors that they could not connect to the network shares. Upon diagnosing the problem, I noticed that I could map the drives via the IP Address of the server which immediately got me thinking it was a DNS issue. I looked at the server and the Forwarders were pointing to the DNS of the ISP so I removed those entries and unchecked to allow forwarders. I also noticed that the router IP (DHCP server) was entered in the static DNS on the server. I removed that and just left the IP Address of the server in there since it is the DNS server. Upon looking at the Event Viewer of the server, there are numerous Event ID messages. Some are Under SYSTEM LOG: 5774, Under DNS SERVER: 7063, Under File Replication Service: 13552, 13555. I took this client over from a friend that got out of the business and they have been working fine up until last week. One other thing I see in the Event Viewer is under SECURITY LOG there are FAILED AUDITS every once in a while. I have never seen this before. The majority of the systems on the network are Windows 2000. However, there are a few Windows XP Pro and a couple of Windows NT. Just FYI, I can ping all of the IP addresses but cannot ping computer names anymore. Can someone please help me with this as I am stumped and the client assumes they are down. Thanks!