Exchange Replication faied with Passive disconnected and resyn

Question

Exchange Replication faied with Passive disconnected and resyn

alan gao 176

I have 4 exchange 2016 in a DAG setup. there are two sites with two exchange servers on each site. I had to rebuild the exch servers due to recent attack. Now when I ran add-mailboxdatabasecopy and it always fails with Passive Disconnected and resynchronizing message.
I have deleted the DB and run Update-MailboxDatabaseCopy -Identity DB1\MBX1 - -DeleteExistingFiles with same result.

test-replicationhealth shows below error

server1: ClusterNetwork: Failed. network 'replicationDagnetwork01' has no network interface for server 'server2'. Correct the physical network configuration so that each mailbox server hasw exactly one interface on each subnet.

get-databaseavailablitygroupNetwork shows:

Name               : MapiDagNetworkDescription
Subnets            : {{10.111.1.0/24,Up}, {10.112.1.0/24,Up}}
Interfaces         : {{mbx1,Up,10.111.1.221}, {mbx3,Up,10.111.1.223}, {mbx2,Up,10.112.1.222}, {MBX4,Up,10.112.1.224}}
MapiAccessEnabled :True
ReplicationEnabled : True
IgnoreNetwork      : False
Identity           : exchangedag\MapiDagNetwork
IsValid            : True
ObjectState        : New

Name               : ReplicationDagNetwork01
Description        :
Subnets            : {{fe80::/64,Up}}
Interfaces         : {{mbx1,Up,fe80::b83e:c6fb:15db:488%13}, {mbx2,Up,fe80::4888:b345:5731:b06b%16}}
MapiAccessEnabled  : False
ReplicationEnabled : True
IgnoreNetwork      : False
Identity           : exchangedag\ReplicationDagNetwork01
IsValid            : True
ObjectState        : New

It seems that the ClusterNetwork has misconfiguration. I use one physical NIC card with both IPv4&6 enabled. It seem use IPV6 to replicate. The Database avalibility group IP address is 255.255.255.255.
How can I fix this issue? Thanks.

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Answer 1

Yuki Sun-MSFT 41,376 Moderator

Hi @alan gao ,

Please refer to the blog below and make sure your MAPI and Replication networks are configured properly:

Network Adapter Configurations For DAG Members
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

Then run the following command to reassess the network configuration and check the result:

Set-DatabaseAvailabilityGroup <DAGIdentity> -ManualDagNetworkConfiguration $true

Should the error persists, would you please have a check at the Event Viewer and see if there's any relevant events recorded out there?

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alan gao 176 Reputation points

2021-03-25T03:21:25.173+00:00

I only have 1 team network in each server. I checked the article (Network Adapter Configurations For DAG Members) and it is right. if I run Set-DatabaseAvailabilityGroup <DAGIdentity> -ManualDagNetworkConfiguration $true, it will set networkconfiguration to manual.

As I have posted below, the replication interfaces only have 2 servers. How can I add 2 more server to it?

Name : ReplicationDagNetwork01
Subnets : { {fe80::/64,Up}}
**Interfaces : { {mbx1,Up,fe80::b83e:c6fb:15db:488%13}, {mbx2,Up,fe80::4888:b345:5731:b06b%16}}*******

I don't need a replication network, since there is only one team network. It should be used for both mapi and replication. how to setup replication network in this case?
alan gao 176 Reputation points

2021-03-25T03:31:06.687+00:00

I followed the link to configure my NIC IP settings. I only have 1 team network in each and every server. I checked the article (Network Adapter Configurations For DAG Members) and it is right.

As I have posted below, the ReplicationDagNetwork01 interfaces only have 2 servers. How can I add 2 more server to it? The two sites have different IP subnet. Mbx1&3 in one site. Mbx2 &4 in another site. It is not configured correctly.

Name : ReplicationDagNetwork01
Subnets : { {fe80::/64,Up}}
Interfaces : { {mbx1,Up,fe80::b83e:c6fb:15db:488%13}, {mbx2,Up,fe80::4888:b345:5731:b06b%16}}

I don't need a replication network, since there is only one team network. It should be used for both mapi and replication. how to setup replication network in this case? if I run Set-DatabaseAvailabilityGroup <DAGIdentity> -ManualDagNetworkConfiguration $true, it will set networkconfiguration to manual. How can it help?
Yuki Sun-MSFT 41,376 Reputation points Moderator

2021-03-26T08:45:53.86+00:00

Hi @alan gao ,

Based on my research, running "Set-DatabaseAvailabilityGroup <DAGIdentity> -ManualDagNetworkConfiguration $true" can force the DAG to reassess the network configuration and might help result in a correct DAG network configuration. So I'd suggest having a go and see if the remaining 2 servers can be added into the ReplicationDagNetwork01.

Reference: Misconfigured Subnets Appear in Exchange Server 2013 DAG Network
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
alan gao 176 Reputation points

2021-03-28T16:50:36.737+00:00

I ran it. Set-DatabaseAvailabilityGroup <DAGIdentity> -ManualDagNetworkConfiguration $true
It did solve the problem. It didn't add the other server to the replicationnetwork.
Yuki Sun-MSFT 41,376 Reputation points Moderator

2021-03-29T23:43:26.207+00:00
Hi @alan gao ,

It did solve the problem.

Do you mean the error in the output of test-replicationhealth has got resolved and you can now run the add-mailboxdatabasecopy successfully? If this is the case, you may set the DAG back to automatic network configuration as mentioned in the article shared earlier:

Set-DatabaseAvailabilityGroup <DAGIdentity> -ManualDagNetworkConfiguration $false

Regarding your concern about the replication network, you could just leave it like it is as currently your MAPI network has been set for both MAPI and replication.

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Yuki Sun-MSFT 41,376 Reputation points Moderator

2021-04-02T05:58:54.107+00:00

Hi @alan gao ,

I am following up to see if you have any further concerns or questions on this.

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Exchange Replication faied with Passive disconnected and resyn

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