Hi all,
I'm having an issue creating a DAG in Exchange 2013.
We have a CAS Server which is also our witness server and 2 mailbox servers. All servers running Windows Server 2012 Standard, Exchange 2013 + CU3.
When I try to add the mailbox servers into the DAG I get the following error message:
A server-side database availability group administrative operation failed. Error The operation failed. CreateCluster errors may result from incorrectly configured static addresses. Error: Computer account 'EXCDAG13' couldn't be validated by user 'NT AUTHORITY\SYSTEM'.
Error: Unknown error (0xc000018b). [Server: EXCMB1.contoso.local]
A server-side database availability group administrative operation failed. Error The operation failed. CreateCluster errors may result from incorrectly configured static addresses. Error: Computer account 'EXCDAG13' couldn't be validated by user 'NT AUTHORITY\SYSTEM'.
Error: Unknown error (0xc000018b). [Server: EXCMB2.contoso.local]
I have followed all the correct steps:
Step 1 – Pre-Stage DAG Computer Account
- Created a Computer Account in AD with the name of the DAG
- Disabled the Computer Account
- Granted the Exchange Trusted Subsystem group Full Control permissions
- Although this step isn’t necessary as I did the step above, I also added in the Computer Account of the first node EXCMB1.contoso.local and Granted Full Control permissions
Step 2 – Configure DAG NIC’s
- Configured a MAPI/Replication network
EXCMB1.contoso.local:
MAPI Network 172.19.220.45 Subnet Mask 255.255.255.0 Default Gateway 172.19.220.250
Replication Network 10.1.1.1 Subnet Mask 255.255.255.0 Default Gateway NONE
EXCMB2.contoso.local:
MAPI Network 172.19.220.46 Subnet Mask 255.255.255.0 Default Gateway 172.19.220.250
Replication Network 10.1.1.2 Subnet Mask 255.255.255.0 Default Gateway NONE
- Configured the NIC Binding Order
- Unchecked register this connections address in DNS for the Replications Replication Networks
- Verified network connectivity is ok with the MAPI/Replication networks
Step 3 – Create DAG & Add Nodes
- Give the DAG a static IP Address of 172.19.220.47
I have gone through heaps of articles online and I am yet to come across anyone who has had the same error as me?
Any help will be highly appreciated.
Thank you