Hosts in a Network Load Balancing (NLB) cluster are configured to load balance network traffic. Host configuration is set by using NLB Manager, and if it is not configured properly, the NLB cluster may not function correctly.
Check that the correct IPv4/IPv6 version is installed on the network adapter
The correct IP stack version (IPv4 or IPv6) must be installed on the network adapter to which Network Load Balancing (NLB) is bound. The virtual IP address must be in a valid IPv4 or IPv6 format.
Check that the correct IP stack version is installed on the network adapter
To check that the correct IP stack version (IPv4/IPv6) is installed on the network adapter:
Click Start, click Network, and then click Network and Sharing Center.
Under Tasks, click Manage network connections.
Right-click the network adapter, and click Properties.
On the Networking tab, verify that the correct IP stack is installed and that it is in a valid format. IPv4 addresses use the standard Internet dotted notation (for example, w.x.y.z). IPv6 addresses use 16-byte addresses, typically expressed in colon-hexadecimal notation. Colon-hexadecimal notation uses eight 4-digit hexadecimal numbers, with colons separating the 16-bit blocks (the 4-digit numbers). To manage addresses more easily, IPv6 suppresses leading zeros and compresses a single contiguous all-zero 16-bit block, represent the contiguous block with two colons (::). This is known as double-colon compression. An example of an IPv6 address with leading zeros suppressed is: FEC0:0:0:0:2AA:FF:FE3F:2A1C.
Disable and re-enable all network adapters
To disable and re-enable all network adapters:
Right-click the network adapter you want to disable, and click Disable. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Right-click the network adapter you want to enable, and click Enable. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.