We have 3 mail servers in a DAG - 2 of them on the same lan/subnet and the other server is in a remote location with point to point line on a separate subnet.  I'm not able to replicate over the p2p line but replication works on the local Lan.  I've struggled with this issue for over a week now trying to setup numerous DAGs - traditional and IPless - checked WFS settings,  replication network adapter settings, forcing AD replication, manually seeding databases. Could this be related to bandwidth?  We have a 100 mbps line between 2 sites. Or maybe we need to isolate replication network in a separate vlan ?

primary site                                                                               remote site

EX 01 - CAS/MB                                      EX02 MB                        EX03

MAPI NIC 10.11.1.0/24 network             same                  MAPI NIC 10.11.13.0/24 network

REPL NIC 192.168.0.0/29 network          same                 REPL NIC  192.168.0.0/29 network

Related threads here :

https://social.technet.microsoft.com/Forums/office/en-US/aaf904b7-809c-4fce-a2ca-673b17d127fb/witness-server-and-directory-in-use-doesnt-match-the-configured-primary-witness-server?forum=exchangesvravailabilityandisasterrecovery#ad06b29c-4ea4-4ab5-baf9-0723c46af894



https://social.technet.microsoft.com/Forums/office/en-US/a1b44332-6197-41ca-bd0e-fac5a9eadc04/ipless-dag-witnessshareinuse-none-databases-cant-be-seeded?forum=exchangesvravailabilityandisasterrecovery#fee88b29-29c1-426a-85c4-37e9d12e0670

Hi,

Is there any related error event in application log?

Please check below:

1. Enable/disable IPv6 in TCP/IP

2. Enable/Disable firewall in server

3. Check DcDiag /s and NetDiag and verify report for DC connection.

Thanks,

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Hi,

Is there any update on this thread?

Thanks,

Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com

Does Test-ReplicationHealth provide any additional information? Can the machines Ping each other? Are the copies Failed? Do they have any information in the ErrorMessage field from Get-MailboxDatabaseCopyStatus?