NLB can't track TCP connections because it was unable to open the TCP connection callback object Rule

  • ID:  Microsoft.Windows.NetworkLoadBalancing.6.2.NLB.cant.track.TCP.connections.because.it.was.unable.to.open.the.TCP.connection.callback.object
  • Description:   
  • Target:  Windows Server 2012 NLB Server Role
  • Enabled:  On Essential Monitoring

Overridable Parameters

Parameter Name Default Value Description Override
Event Collection Enabled false  

Run As Profiles

Name
Default

Rule Knowledgebase

Summary

The Network Load Balancing (NLB) driver on the host tracks connections to maintain client/network affinity configured on the NLB cluster. If the driver is not functioning properly, NLB may not be able to track TCP connections or may experience load distribution errors.

Causes
This rule does not contain any causes.
Resolutions

Disable and enable NLB network adapters

If Network Load Balancing (NLB) is unable to open a TCP connection callback object, then NLB cannot track TCP connections. Although NLB will still accept new connections, it will not track the connection state, which may cause the affinity that is maintained by the driver during the connection to break. You should disable and re-enable the network adapter before attempting to bind NLB to the adapter again.

To disable and re-enable all network adapters:

  • Click Start, click Network, and then click Network and Sharing Center

  • Under Tasks, click Manage network connections.

  • 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.

External References
This rule does not contain any external references.

See Also for Windows Server Network Load Balancing Management Pack


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