With the information you provided, I can only guess. This can happen for any of three reasons:
Reason #1
There is a duplicate IP to the server's IP. Please check your network IPs and make sure to fix the duplicate IP by changing it to something different.
Reason #2
The server is out of range for the client machines because of one of the following:
- Multiple vlans are configured on the switch and the server is on a different vlan than the client machines. Please check if vlans are configured on your switch and make sure the server and the client machines are on the same vlan.
- The subnet masks for the server and the client machines do not match. For example the servers subnet mask might be
255.255.0.0
while the clients subnet mask might be 255.255.255.0
. Please check the subnet masks on the server and the client machines and make sure they are all on the same IP class and the same subnet mask.
Reason #3
There is some sort of security device in between the server and the client machines for example a firewall a proxy or an antivirus... etc ( wireless access points with ap isolation enabled
included ). Please check and make sure nothing is blocking or interfering with the connection between the server and the client machines.