Home » Categories » Multiple Categories

Nagios XI - LDAP / Active Directory - Import Users Certificate Issues

Problem Description

When using the "LDAP / Active Directory Import Users" component in Nagios XI you may receive an error like the following when attempting to login:

Unable to authenticate: TLS error-8179:Peer's Certificate issuer is not recognized.

 

Issues like these can occur when the certificate you've added to Nagios XI is for a root CA when a subordinate CA is what actually issued the certificate, this subordinate CA certificate will also need to be uploaded.

 

Resolving the Problem

Delete Certificates

First step is to remove the existing certificates.

  • Log into the Nagios XI Web interface

  • Navigate to Admin > Users > LDAP/AD Integration

    • Under the Certificate Authority Management section

    • Delete all the existing certificates by clicking the X icon in the Actions column

 

Ensure Environment Is Correctly Setup

Log into your Nagios XI server in an SSH session and execute the following commands:

mkdir -p /etc/openldap/cacerts
chown apache.nagios /etc/openldap /etc/openldap/cacerts /etc/openldap/certs
chmod 664 /etc/openldap/ldap.conf
chmod 775 /etc/openldap /etc/openldap/certs /etc/openldap/cacerts
sed -i 's/TLS_CACERTDIR/#TLS_CACERTDIR/g' /etc/openldap/ldap.conf
echo "TLS_CACERTDIR /etc/openldap/cacerts" >> /etc/openldap/ldap.conf

 

The last step is to restart the Apache service using one of the commands below:

RHEL 6 | CentOS 6 | Oracle Linux 6

service httpd restart

 

RHEL 7 | CentOS 7 | Oracle Linux 7

systemctl restart httpd.service

 

Ubuntu 14

service apache2 restart

 

Debian | Ubuntu 16/18

systemctl restart apache2.service

 

 

Add Certificates

Now add all the required CA certificates.

  • Log into the Nagios XI Web interface

  • Navigate to Admin > Users > LDAP/AD Integration

    • Under the Certificate Authority Management section

    • Click the Add Certificate button

      • Paste the text from your certificate and then click the Add Certificate button

    • Repeat until all the required certificates have been added

 

Once you have completed the above steps the Import Users functionality will work if the CA certificates match the LDAP / Active Directory they are authenticating against.

 

 

Final Thoughts

For any support related questions please visit the Nagios Support Forums at:

http://support.nagios.com/forum/

1 (2)
Article Rating (2 Votes)
Rate this article
  • Icon PDFExport to PDF
  • Icon MS-WordExport to MS Word
Attachments Attachments
There are no attachments for this article.
Related Articles RSS Feed
Nagios XI - Upgrading To PHP 7
Viewed 2833 times since Tue, Oct 22, 2019
Nagios XI - Disabling Database UTF8 Connectivity
Viewed 1411 times since Thu, Mar 8, 2018
Nagios XI - SNMP Trap v3 Configuration
Viewed 8888 times since Tue, Nov 13, 2018
Nagios XI - Customizing The Landing Page
Viewed 1801 times since Wed, Jan 27, 2016
Nagios XI - Integrating Mod-Gearman With Nagios XI
Viewed 2750 times since Thu, Jan 28, 2016
Nagios XI - Multi-Tech iSMS Integration
Viewed 1334 times since Thu, Jan 28, 2016
Nagios XI - Should You Change RRD Retention Periods?
Viewed 1463 times since Sun, Nov 12, 2017
SNMP Traps - Standard Handler vs Embedded Handler
Viewed 4604 times since Mon, Oct 24, 2016
Nagios XI - How to Authenticate and Import Users with Active Directory
Viewed 2169 times since Wed, Jan 27, 2016
Nagios XI - Virtual Machine Notes
Viewed 1774 times since Thu, Jan 28, 2016