A new server was installed. Most clients are located in the same subnet as the server and can successfully access the server. Clients located on different subnets have been unable to access the server

If DHCP assigned wrong addresses, clients likely wouldn't be able to access any network resources or servers, including those on their own subnet, which contradicts the problem description.

The default gateway is the router IP address that a server uses to send traffic to destinations outside its local subnet. If the server's default gateway is misconfigured or missing, it cannot properly route packets to clients located on different network segments, even if those clients can reach other servers.

Missing DNS entries would prevent clients from resolving the server's hostname, but they could still access it via its IP address if routing was functional.

WINS (Windows Internet Name Service) is primarily for NetBIOS name resolution in older Windows environments and would not prevent IP-based connectivity across subnets if the IP address is known.