Adding new DAG member from different subnets

Trying to enable DAG between on-premises site and remote site (vchs.vmware.com). I have 2 Exchange 2010 SP2 Servers on-premises with DAG configured on different network (172.16.2.0/24) physically isolated from local LAN (10.1.0.0 /16). It is a IPSec VPN configured between sites with traffic IP any any enabled.
The remote site configured with main LAN (10.15.1.0/16) and DAG Replication network (172.16.1.0/24). I can ping both sites from either DAG or MAPI network.
Trying to add another server from a remote site to DAG Group. The following error occurred:

[PS] C:\Windows\system32>Add-DatabaseAvailabilityGroupServer -Identity STRIB-DAG -MailboxServer CLOUD-EXCH1.striblingny.com
WARNING: The operation wasn't successful because an error was encountered. You may find more details in log file "C:\ExchangeSetupLogs\DagTasks\dagtask_2013-10-24_14-27-05.349_add-databaseavailabiltygroupserver.log".
A database availability group administrative operation failed. Error: The operation failed. CreateCluster errors may result from incorrectly configured static addresses. Error: An error occurred while attempting a cluster operation. Error: Cluster API '"AddClusterNode() (MaxPercentage=100) failed with 0x5b4. Error: This operation returned because the time
out period expired"' failed. [Server: EX2KMBOX.striblingny.com]
    + CategoryInfo          : InvalidArgument: (:) [Add-DatabaseAvailabilityGroupServer], DagTaskOperationFailedException
    + FullyQualifiedErrorId : 1510433,Microsoft.Exchange.Management.SystemConfigurationTasks.AddDatabaseAvailabilityGroupServer

Log file is attached.

Is it any requirements to do this over different subnets? Please advise.
dagtask-2013-10-24-14-27-05.349-.log
Armen MinasyanDirector of ITAsked:
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Rodney BarnhardtConnect With a Mentor Server AdministratorCommented:
Possibly. I have never mixed the two. Best practice is for all servers to be the same version, service pack, etc.
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Rodney BarnhardtServer AdministratorCommented:
Your problem seems identical to this other EE post. I would try the solution suggested by Sembee2 on this post.

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_28168743.html
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Armen MinasyanDirector of ITAuthor Commented:
Thanks! The problem is that I have a production servers with multiple DB's and 2 DAG member and I just need to add another server to it in remote DR location, so, removing all this is not a solution for me. Any other thoughts on it? Thank you in advance, A
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Rodney BarnhardtServer AdministratorCommented:
Is the server you are trying to add the DAG on an Enterprise edition?

Also, I have read of a similar problem when the replication network was on teamed NIC's.

Also, have all pre-requisites been met on the destination server?
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Rodney BarnhardtServer AdministratorCommented:
Also, what is your latency? There could be too much latency since the error indicates a timeout?
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Armen MinasyanDirector of ITAuthor Commented:
All servers are Ent Edition, yes.

Exchange NIC's are not teamed. It's one NIC for MAPI and one for DAG Replication on each machine. They all virtual on vmware hosts.

What are the prerequisites for the DAG? NIC tunning, such as disabling some services?
Also, if I'm pinging across VPN tunnel from one side to another - the timing is around 80-83 ms - Is this too much?

Also, on the server which I'm trying to add to DAG I have this error event ID 1282:

Security Handshake between local and remote endpoints '10.15.1.14:~40775~ -> 10.1.1.14:~3343~' did not complete in '40' seconds, node terminating the connection
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Armen MinasyanDirector of ITAuthor Commented:
Can it be that the Cluster Services on my on premises servers (Windows 2008 R2) are not compatible with Cluster Services on my remote site (Windows 2012)?
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Armen MinasyanDirector of ITAuthor Commented:
I created an additional server with Windows 2008R2 and everything works fine. Seems like I cannot mix 2012 and 2008R2 servers on Failover Cluster.
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