unable to connect to AIX server

Dears, 

I have an issue with AIX server I have added it in our SPP and it was working just fine, however now when I test the connection or want to do discover accounts it shows the below error: 

Please note that I am using SPP 6.13

Also, the users can normally login and request a root password for this server with no issue. (this issue is showing in many servers with the same error) 

I have deleted the asset and added it again with no luck. 

failed with error: Keyboard-Interactive authentication failed. The following authentication methods are available for this user: publickey,password,keyboard-interactive..
System connection test failed.
Saving task results.
Task completed with failure.

thanks