Avamar: Data Domain monitoring shows incorrect error when SNMP connectivity between Avamar and Data Domain is not healthy

Avamar Administrator GUI shows the Data Domain monitoring status shows as "Failed to authenticate SSH CLI connection with ssh key"

From the Avamar Server: 

mccli dd show-prop --name=dd-hostname-removed
0,23000,CLI command completed successfully.
Attribute                                     Value
--------------------------------------------- -------------------------------------------------------
IPv4 Hostname                                 dd-hostname-removed
...
User Name                                     ddboost-user-removed
Default Replication Storage System            Yes
Target For Avamar Checkpoint Backups          Yes
Maximum Streams For Avamar Checkpoint Backups 2
Maximum Streams                               50
Maximum Streams Limit                         540
Instant Access Limit                          32
DDOS Version                                  6.1.1.20-594920
Serial Number                                 DD-SERIAL-REMOVED
Model Number                                  DD7200
...
Monitoring Status                             Failed to authenticate SSH CLI connection with ssh key.
Cloud Tier                                    VirtStream-test
SNMP status                                   Enabled
File System Status                            File System Unknown

Verify that SSH login using the ddr_key is working without any issues. 

Login to the Avamar Server via SSH as admin user and load the ddr_key

ssh-agent bash 
ssh-add /home/admin/.ssh/ddr_key

Attempt to login to the Data Domain using the ddboost user

ssh  ddboost_user_name@datadomain_hostname

Note: Replace the ddboost_user_name and datadomain_hostname with the correct values

The login should not prompt for a password. If the login prompts for a password, stop following this KB and engage DELL| EMC Avamar Technical support to investigate the issue by creating a Service Request. 

Verify the health of SNMP between the Avamar and the Data Domain using the following command from the Avamar Server: 

snmpget -v 2c -c community_string -t 1 -r 2 datadomain_hostname 1.3.6.1.4.1.19746.1.13.1.1.0

Timeout: No Response from datadomain_hostname.

Note: Replace the community_string and datadomain_hostname with the correct community string that is used for SNMP on the Data Domain and the correct hostname of the Data Domain

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