admintools locale issue

What do you think about the below problem? If I did not set my locale correctly admintools did not show me the correct results. Is it the expected thing?

[dbadmin@ver04 ~]$ locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=en_US.UTF-8
LC_CTYPE=UTF-8
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=
[dbadmin@ver04 ~]$ admintools -t list_allnodes
WARNING: Unable resolve host  10.2.1.2
WARNING: Unable resolve host  10.2.1.3
WARNING: Unable resolve host  10.2.1.5
WARNING: Unable resolve host  10.2.1.4
 Node                 | Host          | State   | Version           | DB
----------------------+---------------+---------+-------------------+-----------
 v_myvert_node0001 | 10.2.1.2  | UNKNOWN | vertica-7.0.1.000 | myvert
 v_myvert_node0002 | 10.2.1.4 | UNKNOWN | vertica-7.0.1.000 | myvert
 v_myvert_node0003 | 10.2.1.5 | UNKNOWN | vertica-7.0.1.000 | myvert
 v_myvert_node0004 | 10.2.1.3  | UNKNOWN | vertica-7.0.1.000 | myvert

[dbadmin@ver04 ~]$ export LC_ALL=en_US.UTF-8
[dbadmin@ver04 ~]$ admintools -t list_allnodes
WARNING: Unable resolve host  10.2.1.3
WARNING: Unable resolve host  10.2.1.2
WARNING: Unable resolve host  10.2.1.4
WARNING: Unable resolve host  10.2.1.3
 Node                 | Host          | State | Version           | DB
----------------------+---------------+-------+-------------------+-----------
 v_myvert_node0001 | 10.2.1.2  | UP    | vertica-7.0.1.000 | myvert
 v_myvert_node0002 | 10.2.1.4 | UP    | vertica-7.0.1.000 | myvert
 v_myvert_node0003 | 10.2.1.5 | UP    | vertica-7.0.1.000 | myvert
 v_myvert_node0004 | 10.2.1.3  | UP    | vertica-7.0.1.000 | myvert