NLB Port Rules Configuration
Applies To: Windows Server 2008
In a Network Load Balancing (NLB) cluster, port rules are configured to control how each port's cluster network traffic is handled. The NLB cluster may fail to converge unless each port rule has a unique host priority (a number between 1 and 32), the port rules are consistent on all cluster hosts, you are using the proper number of port rules, and the virtual IP address is specified in a valid IPv4 or IPv6 address format.
Events
| Event ID | Source | Message |
|---|---|---|
Microsoft-Windows-NLB |
NLB cluster [%2]: NLB failed to converge due to port rules with a duplicate single host priority %5 in the cluster. Each single host port rule in the NLB cluster must have a unique priority. Please check the NLB configuration of all port rules and make sure that each has a unique host priority (a number between 1 and 32). | |
Microsoft-Windows-NLB |
NLB cluster [%2]: NLB failed to converge due to inconsistencies in the port rules between this host and cluster host %5. This will occur if the number of port rules or the type of port rules are different between hosts. Please make sure that the port rules are consistent on all cluster hosts. | |
Microsoft-Windows-NLB |
NLB cluster [%2]: The NLB driver failed to initialize because the number of port rules must be between 0 and %5. It is currently specified as %6 in the registry. Please check the NLB configuration to ensure that you are using the proper number of rules. | |
Microsoft-Windows-NLB |
NLB cluster [%2]: A port rule operation on port %3 was issued but there is no port rule that contains this port. Please confirm that the intended port number is correct, or configure a port rule for this port number. | |
Microsoft-Windows-NLB |
NLB cluster [%2]: The NLB driver has detected one or more %3 sessions corresponding to a port rule that is improperly configured. To handle VPN traffic properly, the port rule must be configured with single or network affinity and the port range must include TCP port 1723 for PPTP/GRE and UDP ports 500/4500 for IPSec/L2TP. | |
Microsoft-Windows-NLB |
NLB cluster [%2]: The virtual IP (VIP) address in a port rule is invalid. The cluster will converge and operate normally but this port rule will be ignored. Make sure that the VIP is specified in a valid IPv4 or IPv6 address format. |