Troubleshooting connectivity problems to DataDomain appliance

Hello:

I'm trying to connect to a DataDomain appliance, for which I've followed all steps:
- testing the TCP connection over port 22 - OK;
- created stor2rrd user on the appliance (user role) - Done;
- imported the SSH-RSA key inside DataDomain (per instructions) - location: /home/stor2rrd/.ssh/id_rsa.pub ;
- encrypted the password on the server side;
- modified and saved etc/storage-list.cfg file;

Data Domain OS 6.0.2.20-587212

The problem is when I run:
./bin/config_check.sh DataDomain_Alias

response:
=========================
STORAGE: DataDomain_Alias: DATADOMAIN
=========================
TCP connection to "my_IP" on port "22" is ok
ssh -o ConnectTimeout=80 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -o SendEnv=no -q stor2rrd@my_IP  "system show all"
  connection failed!!


The question is this: is there a log that will show me why the connection fails?

Please advise.

Sincerely yours,
Alex H.