Git clone over ssh in BPMS on Tomcat

Issue

• We are trying to clone the git repository using ssh from business-central in Tomcat. But it fails with authentication error. Do we need any additional setting in this case? The same works when we run BPMS on EAP.
• When I try to clone a customer repository from BRMS / BPM Suite managed repositories, I get user authentication error like this:

$ git clone ssh://testadmin@localhost:8001/repository1
Cloning into 'repository'...
Password authentication
Password: 
Password authentication
Password: 
Password authentication
Password: 
testadmin@localhost's password: 
Permission denied, please try again.
testadmin@localhost's password: 
Permission denied, please try again.
testadmin@localhost's password: 
Permission denied (password,keyboard-interactive).
fatal: The remote end hung up unexpectedly