A failover cluster requires network connectivity among nodes and between clients and nodes. Problems with a network adapter or other network device (either physical problems or configuration problems) can interfere with connectivity.
Resolutions
Check network adapter and other network hardware
If you do not currently have Event Viewer open, see "Opening Event Viewer and viewing events related to failover clustering." After reviewing event messages, choose actions that apply to your situation:
Run the Validate a Configuration Wizard, selecting only the network tests. For more information, see "Using the Validate a Configuration Wizard to review the network configuration."
Check the system event log for hardware or software errors related to the network adapters on this node.
Check the network adapter, cables, and network configuration for the networks that connect the nodes.
Check hubs, switches, or bridges in the networks that connect the nodes.
To perform the following procedures, you must be a member of the local Administrators group on each clustered server, and the account you use must be a domain account, or you must have been delegated the equivalent authority.
Using the Validate a Configuration Wizard to review the network configuration
To use the Validate a Configuration Wizard to review the network configuration:
To open the failover cluster snap-in, click Start, click Administrative Tools, and then click Failover Cluster Management. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
In the Failover Cluster Management snap-in, in the console tree, make sure Failover Cluster Management is selected. Then under Management, click Validate a Configuration.
Follow the instructions in the wizard to specify the cluster you want to test.
On the Testing Options page, select Run only tests I select.
On the Test Selection page, clear all check boxes except those for the Network tests.
Follow the instructions in the wizard to run the tests.
On the Summary page, click View Report.
Opening Event Viewer and viewing events related to failover clustering
To open Event Viewer and view events related to failover clustering:
If Server Manager is not already open, click Start, click Administrative Tools, and then click Server Manager. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
In the console tree, expand Diagnostics, expand Event Viewer, expand Windows Logs, and then click System.
To filter the events so that only events with a Source of FailoverClustering are shown, in the Actions pane, click Filter Current Log. On the Filter tab, in the Event sources box, select FailoverClustering. Select other options as appropriate, and then click OK.
To sort the displayed events by date and time, in the center pane, click the Date and Time column heading.
You can also view the events logged by the cluster service using the link below:
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