Check the state of the networks connecting the nodes to determine which nodes have lost connectivity with other nodes.
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:
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.
To use the Validate a Configuration Wizard to review the network configuration:
To open Event Viewer and view events related to failover clustering:
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.
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.
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