Copy queue length is increasing high

I am using exchange server 2010 in DAG environment. There are three Mailbox servers in DAG. Two exchange server EXCH1, EXCH2 is in same A location and EXCH3 is in B location. EXCH1 and EXCH2 is syncing properly but copy queue length on EXCH3 is increasing high. ping is OK to all servers. I

1. Did telnet to EXCH3 from EXCH1 at 64327, it is connection succesful
2. Did telnet to DAG01 from EXCH1 at port 64327, connection successful
3. Did telent to EXCH1 from EXCH3, connection succesful
4. Did telnet to from EXCH1 to EXCH3 at port 135, successful
5. Did telnet from EXCH3 to EXCH1 at port 135, succesful

4. Did telnet to DAG01 at port 64327 from EXCH3, getting failed.
Arif KhanSystem AdministratorAsked:
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Sunil ChauhanLead AdministratorCommented:
this seems to be an issue with the WAN throughput, from site A to Site B,  it could also be some network issue as well, please get it touch with the network team.
Arif KhanSystem AdministratorAuthor Commented:
As I said. I have reviewed with Network team. There is no issue in network.

When I ping DAG01 from EXCH1, It does not connect.
Sunil ChauhanLead AdministratorCommented:
are there separate replication nics, please check if they are pingable from both of the side, probably static route messed up then.
Arif KhanSystem AdministratorAuthor Commented:
Hi Suni,

I have tested the ping status, seems ok from both side. Telnet is Ok for all servers at 135 and 64327.
Sunil ChauhanLead AdministratorCommented:
if replication network is fine and no change in the server configuration was made,
i would suggest reviewing the events if you could found something there.

Thought I had the similar issue in my environment in the similar setup and the same was caused due to some network issue, and after I contacted the network team they fixed it.

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