Unable to login to Nagios 4.0.2 after Ubuntu upgrade 14.04

[stewlg]

Here you go:

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root@griffin:~# ls -al /etc/apache2/conf-enabled/
total 8
drwxr-xr-x 2 root root 4096 Oct  6 22:24 .
drwxr-xr-x 9 root root 4096 Oct  6 22:23 ..
lrwxrwxrwx 1 root root   30 Oct  6 22:23 charset.conf -> ../conf-available/charset.conf
lrwxrwxrwx 1 root root   28 Oct  6 22:23 httpd.conf -> ../conf-available/httpd.conf
lrwxrwxrwx 1 root root   44 Oct  6 22:23 localized-error-pages.conf -> ../conf-available/localized-error-pages.conf
lrwxrwxrwx 1 root root   30 Oct  6 22:24 nagios3.conf -> ../conf-available/nagios3.conf
lrwxrwxrwx 1 root root   46 Oct  6 22:23 other-vhosts-access-log.conf -> ../conf-available/other-vhosts-access-log.conf
lrwxrwxrwx 1 root root   31 Oct  6 22:23 security.conf -> ../conf-available/security.conf
lrwxrwxrwx 1 root root   36 Oct  6 22:23 serve-cgi-bin.conf -> ../conf-available/serve-cgi-bin.conf

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root@griffin:~# ls -al /etc/apache2/sites-enabled/
total 8
drwxr-xr-x 2 root root 4096 Oct  6 22:23 .
drwxr-xr-x 9 root root 4096 Oct  6 22:23 ..
lrwxrwxrwx 1 root root   35 Oct  6 22:23 000-default.conf -> ../sites-available/000-default.conf
root@griffin:~# 

[Box293]

Please post the contents of:

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/etc/apache2/conf-enabled/nagios3.conf

[stewlg]

nagios3.conf:

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# apache configuration for nagios 3.x
# note to users of nagios 1.x and 2.x:
#       throughout this file are commented out sections which preserve
#       backwards compatibility with bookmarks/config for older nagios versios.
#       simply look for lines following "nagios 1.x:" and "nagios 2.x" comments.

ScriptAlias /cgi-bin/nagios3 /usr/lib/cgi-bin/nagios3
ScriptAlias /nagios3/cgi-bin /usr/lib/cgi-bin/nagios3
# nagios 1.x:
#ScriptAlias /cgi-bin/nagios /usr/lib/cgi-bin/nagios3
#ScriptAlias /nagios/cgi-bin /usr/lib/cgi-bin/nagios3
# nagios 2.x:
#ScriptAlias /cgi-bin/nagios2 /usr/lib/cgi-bin/nagios3
#ScriptAlias /nagios2/cgi-bin /usr/lib/cgi-bin/nagios3

# Where the stylesheets (config files) reside
Alias /nagios3/stylesheets /etc/nagios3/stylesheets
# nagios 1.x:
#Alias /nagios/stylesheets /etc/nagios3/stylesheets
# nagios 2.x:
#Alias /nagios2/stylesheets /etc/nagios3/stylesheets

# Where the HTML pages live
Alias /nagios3 /usr/share/nagios3/htdocs
# nagios 2.x:
#Alias /nagios2 /usr/share/nagios3/htdocs
# nagios 1.x:
#Alias /nagios /usr/share/nagios3/htdocs

<DirectoryMatch (/usr/share/nagios3/htdocs|/usr/lib/cgi-bin/nagios3|/etc/nagios3/stylesheets)>
        Options FollowSymLinks

        DirectoryIndex index.php index.html

        AllowOverride AuthConfig
        Require all granted

        AuthName "Nagios Access"
        AuthType Basic
        AuthUserFile /etc/nagios3/htpasswd.users
        # nagios 1.x:
        #AuthUserFile /etc/nagios/htpasswd.users
        require valid-user
</DirectoryMatch>

<Directory /usr/share/nagios3/htdocs>
        Options +ExecCGI
</Directory>

# Enable this ScriptAlias if you want to enable the grouplist patch.
# See http://apan.sourceforge.net/download.html for more info
# It allows you to see a clickable list of all hostgroups in the
# left pane of the Nagios web interface
# XXX This is not tested for nagios 2.x use at your own peril
#ScriptAlias /nagios3/side.html /usr/lib/cgi-bin/nagios3/grouplist.cgi
# nagios 1.x:
#ScriptAlias /nagios/side.html /usr/lib/cgi-bin/nagios3/grouplist.cgi

[Box293]

I'm not sure if this will help but here is a nagios.conf file from a test server I ran up not too long ago on Ubuntu 14.04.01 LTS running Nagios Core 4.0.8.

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# SAMPLE CONFIG SNIPPETS FOR APACHE WEB SERVER
#
# This file contains examples of entries that need
# to be incorporated into your Apache web server
# configuration file.  Customize the paths, etc. as
# needed to fit your system.

ScriptAlias /nagios/cgi-bin "/usr/local/nagios/sbin"

<Directory "/usr/local/nagios/sbin">
#  SSLRequireSSL
   Options ExecCGI
   AllowOverride None
   Order allow,deny
   Allow from all
#  Order deny,allow
#  Deny from all
#  Allow from 127.0.0.1
   AuthName "Nagios Access"
   AuthType Basic
   AuthUserFile /usr/local/nagios/etc/htpasswd.users
   Require valid-user
</Directory>

Alias /nagios "/usr/local/nagios/share"

<Directory "/usr/local/nagios/share">
#  SSLRequireSSL
   Options None
   AllowOverride None
   Order allow,deny
   Allow from all
#  Order deny,allow
#  Deny from all
#  Allow from 127.0.0.1
   AuthName "Nagios Access"
   AuthType Basic
   AuthUserFile /usr/local/nagios/etc/htpasswd.users
   Require valid-user
</Directory>

[stewlg]

Your example was not directly helpful, but your deliberate tour of my configuration made me observe my configuration with more attention.

I think all my issues were due to my Nagios 3.x installation, which was still partly cross-wired with my Nagios 4 installation. I think this nascent problem flared up during the Apache 2.2 => 2.4 transition that I gather happened as part of the Ubuntu 14.04 dist upgrade. I killed the old Nagios3.conf, and renamed the httpd.conf as nagios.conf, then edited it a bit. Here's what nagois.conf looks like now:

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servername griffin.doodle.local

ScriptAlias /nagios/cgi-bin "/usr/local/nagios/sbin"

<Directory "/usr/local/nagios/sbin">
    Options ExecCGI
    AllowOverride AuthConfig
    Require all granted
    AuthName "Nagios Access"
    AuthType Basic
    AuthUserFile /usr/local/nagios/etc/htpasswd.users
    require valid-user
</Directory>

Alias /nagios /usr/local/nagios/share
<Directory "/usr/local/nagios/share">
    Options None
    AllowOverride AuthConfig
    Require all granted
    AuthName "Nagios Access"
    AuthType Basic
    AuthUserFile /usr/local/nagios/etc/htpasswd.users
    require valid-user
</Directory>

I can now log in and see system status - thank goodness. PNP4Nagios is broken, but that's less critical, and anyhow outside of this forum's purview.

Note the "require all granted" syntax that replaces the older syntax you had in your example. This is new to Apache 2.4. (See https://httpd.apache.org/docs/2.4/upgrading.html).

Thank you again for your help.

[slansing]

Ah yes, that is why I am generally frightened by distro upgrades... package conflicts and issues. Glad that it's sorted out for the majority now, let us know if you have any further questions on this. I'll lock this thread down for the time being.