Solution for Can’t Access New Server/NAS/PC from other Systems

Here are a number of things that could cause a new system/NAS to be inaccessible from other machines on a network. First, make sure the new system is definitely connected to the LAN properly and that its network controller is active. And also check that the system’s configured with the correct IP address.
If the server or NAS is on a different subnet, for example, it may appear to be connected to a network, but it won’t be visible to your other systems. With a standalone NAS device, you’ll have to log into its configuration menu, navigate to the LAN settings, and then enter the proper IP address (or set it to DHCP). To change an IP address on Windows 7 systems, you’ll want to go to Network and Sharing Center, click the Local Area Connection, then click the Properties button, highlight Internet Protocol Version 4 (TCP/IPv4), and then click Properties again. You can change the system’s IP address on the General tab.

It’s also possible that your client PC has network discovery disabled or an overzealous firewall that won’t let the system see other devices, so check that, too.