Nibbles: Why doesn't dirb find the login page? (note: minor spoiler for Nibbles)

The admin login page (admin.php) is in dirb’s default wordlist but when I run dirb, dirb fails to find it. what am I doing wrong? What do I need to do differently in future to find these hidden web objects?

`
root@kali:~# dirb http://10.10.10.75/nibbleblog/


DIRB v2.22
By The Dark Raver

START_TIME: Tue Jul 3 03:38:17 2018
URL_BASE: http://10.10.10.75/nibbleblog/
WORDLIST_FILES: /usr/share/dirb/wordlists/common.txt


GENERATED WORDS: 4612

---- Scanning URL: http://10.10.10.75/nibbleblog/ ----
==> DIRECTORY: http://10.10.10.75/nibbleblog/admin/

---- Entering directory: http://10.10.10.75/nibbleblog/admin/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.
(Use mode ‘-w’ if you want to scan it anyway)

---- Entering directory: http://10.10.10.75/nibbleblog/content/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.
(Use mode ‘-w’ if you want to scan it anyway)

---- Entering directory: http://10.10.10.75/nibbleblog/languages/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.
(Use mode ‘-w’ if you want to scan it anyway)

---- Entering directory: http://10.10.10.75/nibbleblog/plugins/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.
(Use mode ‘-w’ if you want to scan it anyway)

---- Entering directory: http://10.10.10.75/nibbleblog/themes/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.
(Use mode ‘-w’ if you want to scan it anyway)


END_TIME: Tue Jul 3 10:43:05 2018
DOWNLOADED: 4612 - FOUND: 3

root@kali:~# grep admin.php /usr/share/wordlists/dirb/common.txt
admin.php

root@kali:~# wget 10.10.10.75/nibbleblog/admin.php
–2018-07-03 11:26:32-- http://10.10.10.75/nibbleblog/admin.php
Connecting to 10.10.10.75:80… connected.
HTTP request sent, awaiting response… 200 OK
Length: 1401 (1.4K) [text/html]
Saving to: ‘admin.php’

admin.php 100%[===================>] 1.37K --.-KB/s in 0s

2018-07-03 11:26:32 (118 MB/s) - ‘admin.php’ saved [1401/1401]
`

dirb Niblesip /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt and why are you using the common list anyway?

Use dirb with -x parameter to test for files with extensions, or it’s only going to look for directories.

Default dirb scan found admin page for me and maybe I’m sleep deprived but looks like it found it on your output too

The defualt dirb found for me admin php page but i created and out put file which less the file which showed me.