Nagios Support Forum

Posted: **Mon Feb 22, 2021 11:20 am**

Hello,

I am having some problems with our AD authentication. We had to restore from backup and now AD authentication is not working. The error seems to be related to the certificate validity when I try to import users.

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Unable to authenticate: error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed (unable to get local issuer certificate)

I have removed and re-uploaded the certificate from our CA per the NagiosXI documentation and have had no luck. AD authentication was working prior to the restore.

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openssl s_client -showcerts -connect x.x.x.x:636 </dev/null
CONNECTED(00000003)
depth=0
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0
verify error:num=21:unable to verify the first certificate
verify return:1

Any help would be appreciated.

Thanks,
Chris

Posted: **Mon Feb 22, 2021 7:29 pm**

Please PM me the full output of this command:

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openssl s_client -showcerts -connect x.x.x.x:636 </dev/null

What OS/version are you running?

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uname -a
cat /etc/*release

Please enable debug logging via this guide and send the debug log output:

https://support.nagios.com/kb/article/a ... n-600.html

Send the output of these commands as well:

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ls -ld /etc/openldap
ls -l /etc/openldap
ls -l /etc/openldap/certs
ls -l /etc/openldap/cacerts
cat /etc/openldap/ldap.conf

Posted: **Tue Feb 23, 2021 9:29 am**

PM sent.

Posted: **Wed Feb 24, 2021 5:17 pm**

Try adding this to your /etc/openldap/ldap.conf:

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TLS_CACERT /etc/openldap/certs/6033c0f9c486e.pem

Then restart apache:

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systemctl restart httpd

If you're using php-fpm, restart that too:

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systemctl restart php-fpm

Then test again.

If that doesn't work:

Please try adding your CA certificate (not the DCs cert) to:

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/etc/pki/ca-trust/source/anchors/

Then run this command:

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update-ca-trust extract

Then edit this file:

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/etc/openldap/ldap.conf

Add this (replacing the other):

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TLS_CACERT /etc/pki/tls/certs/ca-bundle.crt

Then restart apache:

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systemctl restart httpd

If you're using php-fpm, restart that too:

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systemctl restart php-fpm

Then test again and let us know the results.

Posted: **Thu Feb 25, 2021 9:19 am**

Hello,

The first command resolved the issue. The only other problem I had was that I had to re-add the users that were imported via AD. When they logged in they were getting a blank page after authenticating. Recreating the users via import from AD resolved this.

You can close this ticket. Thank you!

Posted: **Fri Feb 26, 2021 11:27 am**

You can close this ticket. Thank you!

Great! Appreciate the update.

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