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Unable to authenticate: Could not connect to the LDAP server
Posted: Sat Jul 24, 2021 9:30 am
by phaandiyan2412
Hi,
I am trying to import users from Active Directory to Nagios XI
When I try to login to my AD server from Nagios XI to import the user's, this message appear :
Unable to authenticate: Could not connect to the LDAP server selected
I do use my admin/password credentials.
What can I do to achieve this.
My Nagios XI Version: 5.8.1
Base D/N: OU=User,OU=Dwelltec,DC=dwelltec,DC=asia
Account Suffix: @dwelltec.asia
Domain Controllers: 192.168.xxx.xxx.dwelltec.asia
Re: Unable to authenticate: Could not connect to the LDAP se
Posted: Mon Jul 26, 2021 11:44 am
by ssax
Please follow this guide to enable AD/LDAP debugging and send me the full output from the tail command from the article after you try to import:
https://support.nagios.com/kb/article/a ... n-600.html
Please PM me a screenshot of Admin > LDAP / AD Integration with the auth server settings expanded.
What is the output of these commands:
- Change X.X.X.X to the IP or DNS name of your AD domain controller before running
Code: Select all
ls -ld /etc/openldap
ls -l /etc/openldap
ls -l /etc/openldap/certs
ls -l /etc/openldap/cacerts
cat /etc/openldap/ldap.conf
echo 'DONE' | openssl s_client -showcerts -connect X.X.X.X:636
What OS and version of PHP are you running?
Re: Unable to authenticate: Could not connect to the LDAP se
Posted: Wed Jul 28, 2021 9:07 am
by phaandiyan2412
Hi There,
Thanks for your update. Anyway, I managed to settle it myself.
Turn out that I just need to add the IP address only of my AD server instead of full address with the domain.
Exp as below:
Base D/N: DC=dwelltec,DC=asia
Account Suffix: @dwelltec.asia
Domain Controllers: 192.168.xxx.xxx
This actually allowed myself to authenticate with the AD server and imported the users successfully.
Thanks Again!!

Re: Unable to authenticate: Could not connect to the LDAP se
Posted: Wed Jul 28, 2021 3:20 pm
by benjaminsmith
This actually allowed myself to authenticate with the AD server and imported the users successfully.
Thanks Again!!
Excellent!
We'll go ahead lock this one up.
Thank you for using Nagios.