Failover doesn't work on
Microsoft Exchange DAG
Event ID 1122, 1123, 1127, 1129, and 1135:
Failover Cluster Network issues
Situation: The client have installed two windows 2008 r2
servers using Microsoft Failover Cluster for Exchange 2010. They have a
failover or DAG issue. They also receive Event ID 1122, 1123, 1127,
1129, and 1135.
Troubleshooting: Here are some case collections:
Case 1: Using the Validate a Configuration Wizard to review the network
To use the Validate a Configuration Wizard to review the network
1. 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.
2. 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.
3. Follow the instructions in the wizard to specify the cluster you want to
4. On the Testing Options page, select Run only tests I select.
5. On the Test Selection page, clear all check boxes except those for the
6. Follow the instructions in the wizard to run the tests.
7. On the Summary page, click View Report.
We found the NIC has an issue. Updating the NIC drive fixes the problem.
Case 2: Opening Event Viewer and viewing events related to failover
To open Event Viewer and view events related to failover clustering:
1. 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
2. In the console tree, expand Diagnostics, expand Event Viewer, expand
Windows Logs, and then click System.
3. 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.
4. To sort the displayed events by date and time, in the center pane, click
the Date and Time column heading.
We found many event related to virtual network. Restarting the VM fixes the
Case 3: Check the network adapter, cables, and network configuration for the
networks that connect the nodes. We found it is the bad cable.
case 4: Check hubs, switches, or bridges in the networks that connect the
nodes. The problem is incorrect switch port configuration.
Also please refer to these post:
Event ID 1135: Cluster node was removed from failover cluster
Event ID 1129: Cluster network is partitioned
Event ID 1126 and 1127: Network is unreachable
Event ID: 1122 and 1123: lost network
Event ID 1126: Cluster network interface is unreachable
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