Data Domain: Web UI reports "Mutual trust may have to be reestablished" in "Replication - Automatic - Summary"

Issue:
Web UI reported the following message in "Replication - Automatic - Summary" section, instead of current replication status.

Mutual trust may have to be reestablished

Meanwhile, CLI "replication show stats" and "replication status" successfully reported current replication status.

Symptom:
Web UI - Replication - Automatic - Summary - select a replication context/pair.

Error connecting to remote host:

Mutual trust may have to be reestablished between Management Host [<local-web-GUI-DD>] and [<remote-replication-DD>].

Web UI is case-sensitive.

If remote-replication-DD is added to local-DD web UI (Replication > Automatic > Manage Systems) in different capitalization than its actual hostname and trust record, then web UI cannot locate the corresponding trust for replication context/pair between local-web-GUI-DD and remote-replication-DD, and error "Mutual trust may have to be reestablished" is reported.

Web UI:
Replication > Automatic > Manage Systems.
Host       DDVE_TSE1.datadomain.com

CLI:

sysadmin@dd7200# replication show config
CTX   Source                                                   Destination                                     Connection          4     mtree://DDVE_TSE1.datadomain.com/data/col1/testrepl   mtree://dd7200.datadomain.com/data/col1/testrepl   DDVE_TSE1.datadomain.com*

sysadmin@dd7200#reg show protocol.gui
protocol.gui.ddem.inventory.4.host_name = DDVE_TSE1.datadomain.com
protocol.gui.ddem.inventory.4.mif = DDVE_TSE1.datadomain.com
protocol.gui.ddem.inventory.4.proxy = DDVE_TSE1.datadomain.com

sysadmin@dd7200#adminaccess trust show
Subject                         Type         Valid From                 Valid Until                Fingerprint
------------------------   ----------   ------------------------   ------------------------   ------------------------------------------------------------
ddve_tse1.datadomain.com   trusted-ca   Sat Jul  1 17:33:41 2017   Tue Jun 23 17:33:41 2048   bb:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx

Resolution:
Re-create record in "Replication > Automatic > Manage Systems" and "trust," to make remote-replication-DD hostname capitalization identical.

Procedure:

1. Add fake host entry to local-web-GUI-DD using CLI.

   net hosts add 1.1.1.1 a.b.com

2. Disable replication context using CLI.

   replication disable <destination>

   Example:

   replication disable mtree://dd7200.datadomain.com/data/col1/testrepl

3. Modify a remote-replication-DD hostname to a fake hostname using CLI.

   replication modify <destination> destination-host|source-host  a.b.com

   Example:

   replication modify mtree://dd7200.datadomain.com/data/col1/testrepl source-host a.b.com

   *If ddve_tse1 is the replication destination, then run:

   replication modify mtree://DDVE_TSE1.datadomain.com/data/col1/testrepl destination-host a.b.com

4. Remove remote-replication-DD using UI. Go to local-DD web UI (Replication > Automatic > Manage Systems), select remote-replication-DD, click remove, and OK.

5. Remove trust using CLI.

   adminaccess trust del host <remote-replication-DD>

   Example:

   adminaccess trust del host ddve_tse1.datadomain.com

6. Add remote-replication-DD with actual capitalization in hostname using UI. A new trust is added during the operation (sysadmin password required). Go to local-DD web UI (Replication > Automatic > Manage Systems), click add - enter remote-replication-DD hostname with actual capitalization, click OK.

7. Modify the remote-replication-DD hostname to the actual hostname using CLI.

   replication modify <destination> destination-host|source-host  <actual_FQDN>

   Example:

   replication modify mtree://dd7200.datadomain.com/data/col1/testrepl source-host ddve_tse1.datadomain.com

   *If ddve_tse1 is the replication destination, then run:

   replication modify mtree://a.b.com/data/col1/testrepl destination-host ddve_tse1.datadomain.com

8. Enable replication context using CLI.

   replication enable <destination>

   Example:

   replication enable mtree://dd7200.datadomain.com/data/col1/testrepl

9. Check replication status using UI (Replication Automatic Summary).

10. Delete fake hosts entry to local-web-GUI-DD using CLI.

    net hosts del 1.1.1.1 a.b.com