Update: it turned out that the container itself isn’t working properly, so that’s the reason why a client can’t connect; container failed due to inability to open a library, specifically - libodbc.so.2;
Now this problem is fixed, but I got a new one, attached a screenshot of build log with message about it.
So, now I’m in search of the fix for this one, next thing I’m gonna do is to find out possible reasons for dlopen() to fail, as it adviced here