Q:

There is no connection tag from Admin menu on Airflow web UI

I'm using admin user to log in. But, there is only Variables this tag inside.
My Airflow Version is 1.10.3

A:

How did you create the airflow user?
I'm guessing you are not a superuser. Airflow supports standard and superuser when not using RBAC.
I would recommend you to create a new user using python shell.
from airflow import models, settings
from airflow.contrib.auth.backends.password_auth import PasswordUser
user = PasswordUser(models.User())
user.username = 'nitin'
user.email = 'nitinl@example.com'
user.password = 'nitin'
user.superuser = True
session = settings.Session()
session.add(user)
session.commit()
session.close()
exit()

