Article ID: 185753 - View products that this article applies to.
This article was previously published under Q185753
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You may not be able to view or connect to any shared resources on a network that uses the Transport Control Protocol/Internet Protocol (TCP/IP), even though your network adapter and network server settings have been verified to work correctly.
This problem can occur if you change the Internet Protocol (IP) address for your computer to any of the following invalid IP addresses in the TCP/IP Properties dialog box:
The specified IP address is not valid. Please check that the value you typed is correct. If you believe the value is correct but you still receive this message, check with your network administrator.
To work around this problem, change the IP address to a valid IP address. To do so, follow these steps:
Microsoft has confirmed this to be a problem in Microsoft Windows 95, Windows 98 and Windows Me.
Networks that use TCP/IP set a unique IP address for each computer to determine its identity. The 127.0.0.1 IP address is reserved for testing the TCP/IP stack with the PING command. The following table lists IP addresses that are not valid for a computer, where <x.y.z> is a range of numbers from 0 to 254.
Invalid IP address Valid (reserved) usage ----------------------------------------------------- 127.0.0.1 Loopback/LocalHost address 255.0.0.0 Class A subnet mask 255.255.0.0 Class B subnet mask 255.255.255.0 Class C subnet mask 225.<x.y.z> - Class D address (multicast only)
240.<x.y.z> - Class E address (reserved)
255.255.255.255 Broadcast address
If you use any of the addresses listed above as the IP address for a computer, no other computer can successfully communicate with it.
A subnet mask is an address for a subnetwork used to expand the range of possible IP addresses on the network. A subnet mask acts to identify an IP address on different subnetworks. TCP/IP uses the binary format to resolve an IP address and subnet mask.
Both the IP address and the subnet mask use binary format for each octet. An IP address consists of four octets. The portion of the octet in binary format that is not used by the subnet mask becomes the portion of the IP address that differentiates it from other IP addresses on the same subnetwork. The assigned IP address and the subnet mask are combined in binary format to create the resolved IP address in a TCP/IP network. If the resolved IP address in binary format is all zeros or ones (for example, 11111111, or decimal 255), it is an invalid IP address.
The following table lists sample IP addresses and subnet masks for an IP address on a Class C subnetwork. These addresses assume that the first three octets of each IP address and subnet mask are valid.
IP address Subnet mask Resolved IP address Result ------------------------------------------------------------- 00000001 (1) 11111100 (252) 11111101 (253) valid 00000011 (3) 11111100 (252) 11111111 (255) invalid
For information about troubleshooting TCP/IP, please see the following article in the Microsoft Knowledge Base:
TITLE : Microsoft TCP/IP Host Name Resolution Order