Hi guys

I have this issue. I am working as an administrator for a research lab which runs a server and some workstations connected on the network. I received a notice to change the DNS ip address. I changed the DNS ip address in all the machines. After this I am not able to see machines in the workgroup. All the systems are in the same workgroup and I am able to ping between them and also able to map network drive but when I click on the "see workgroup computers" it throws me "workgroup is not accessible. you might not have permission to share this network resource. Contact the network administrator. Network path was not found". I tried my best to understand what's going on I could not get it. Can anyone help me out in this. I appreciate your help.