Strange connectivity behavior

Hello,

• I am running a Mariadb server (community editing) (M) in a docker container on a separate Linux server (X).
• I can successfully connect to this Mariadb server in the following scenarios:
  1. Using Beekeeper Studio (community edition) from my macOS laptop (L).
  2. Using the mariadb python connector in a python script running on an Ubuntu development machine (D).

However I cannot connect to M using the mariadb cli client installed on D.

1. I run the mariadb cli client on D as:
   • mariadb -h <hostname for X> -p <remapped container port for M on X) -u <user name with *.* access>
2. I then get the prompt:
   • Enter password:

However after entering my password I always get a failure with the error message:

• ERROR 2002 (HY000): Can't connect to server on 'X' (115)*

I have tried connecting to X using its name as well as IP address, with the same results. Based on the first two successful scenarios, I am sure this is not a network connectivity issue or a name resolution issue.

Is there some way to debug the client?

Many thanks!