Difference between revisions of "Root CA certificate has expired"

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=Root CA certificate has expired=
=Root CA certificate has expired=
{{KB|{{ZC}}|{{ZCS 8.8}}|{{ZCS 9.0}}|}}
{{KB|{{ZC}}|{{ZCS 8.8}}|{{ZCS 9.0}}|}}

Latest revision as of 02:30, 2 June 2020

Root CA certificate has expired

   KB 24097        Last updated on 2020-06-2  

(0 votes)


Ldap servers are unable to communicate with other servers in the ZCS environment

We get the below error when checking the LDAP status

zmcontrol status
Unable to start TLS: SSL connect attempt failed error:14090086:SSL


ldap status
Unable to start TLS: SSL connect attempt failed error:14090086:SSL

How to verify if the Root CA or any intermediate CA has expired

su - zimbra
cd /opt/zimbra/ssl/zimbra/commercial/
zimbra@mail commercial]$ /opt/zimbra/bin/zmcertmgr verifycrt comm commercial.key commercial.crt commercial_ca.crt
** Verifying 'commercial.crt' against 'commercial.key'
Certificate 'commercial.crt' and private key 'commercial.key' match.
** Verifying 'commercial.crt' against 'commercial_ca.crt'
ERROR: Unable to validate certificate chain: commercial.crt: C = SE, O = AddTrust AB, OU = AddTrust External TTP Network, CN = AddTrust External CA Root
error 10 at 3 depth lookup:certificate has expired
C = US, ST = New Jersey, L = Jersey City, O = The USERTRUST Network, CN = USERTrust RSA Certification Authority
error 10 at 2 depth lookup:certificate has expired


1. commercial.key is your private key used to generate the Certificate Signing Request (CSR)

2. commercial_ca.crt is the certificate chain created by bundling the intermediate and root CA

3. commercial.crt is the SSL certificate.


This issue has cropped up because Sectigo (Comodo) Root certificate which is namely AddTrust External CA Root have expired on May 30, 2020. The successor of this root certificate is named the Comodo RSA Certification authority Root, and wil expire in 2038. To fix the issue, download the new Comodo RSA Certification authority Root and re-deploy the SSL certificate.

The new Comodo RSA Certification authority Root can be downloaded from here link

Steps to re deploy the certs

1. Download and save the root CA. (e.g. /tmp/ca.crt)

2. Download any intermediary CAs from your provider to a temporary file. (e.g. /tmp/ca_intermediary.crt)

3. Combine root and intermediary CAs into a temporary file.

cat /tmp/ca_intermediary.crt /tmp/ca.crt > /tmp/ca_chain.crt

4. Move the old certs and recreate the necessary folders

mv /opt/zimbra/ssl/zimbra/ /opt/zimbra/ssl/zimbra.old
mkdir /opt/zimbra/ssl/zimbra/
mkdir -p /opt/zimbra/ssl/zimbra/{ca,commercial,server}
mv /opt/zimbra/ssl/zimbra.old/commercial/commercial.key /opt/zimbra/ssl/zimbra/commercial/commercial.key
chmod 750 /opt/zimbra/ssl/zimbra
chmod 750 /opt/zimbra/ssl/zimbra/*

5. Verify your commercial certificate.

/opt/zimbra/bin/zmcertmgr verifycrt comm /opt/zimbra/ssl/zimbra/commercial/commercial.key /tmp/commercial.crt /tmp/ca_chain.crt
**Verifying /tmp/commercial.crt against
Certificate (/tmp/commercial.crt) and private key
(/opt/zimbra/ssl/zimbra/commercial/commercial.key) match.
Valid Certificate: /tmp/commercial.crt: OK

7. Deploy your commercial certificate.

/opt/zimbra/bin/zmcertmgr deploycrt comm /tmp/commercial.crt /tmp/ca_chain.crt
** Verifying /tmp/commercial.crt against
Certificate (/tmp/commercial.crt) and private key
(/opt/zimbra/ssl/zimbra/commercial/commercial.key) match.
Valid Certificate: /tmpt/commercial.crt: OK
**Copying commercial.crt to /opt/zimbra/ssl/zimbra/commercial/commercial.crt
**Appending CA chain /tmp/ca_chain.crt to
**Saving server config key zimbraSSLCeretificate…done.
**Saving server config key zimbraSSLPrivateKey…done.
**Installing mta certificate and key…done.
**Installing slapd certificate and key…done.
**Installing proxy certificate and key…done.
**Creating pkcs12 file /opt/zimbra/ssl/zimbra/jetty.pkcs12…done.
**Creating keystore file /opt/zimbra/mailbox/etc/keystore…done.
**Installing CA to /opt/zimbra/conf/ca…done.

8. To finish, verify the certificate was deployed.

/opt/zimbra/bin/zmcertmgr viewdeployedcrt

A quick Fix till the root CA is installed

Disable the TLS on the LDAP server as a workaround till the certificates are re-deployed

Execute the below commands on the LDAP servers

zmlocalconfig -e ldap_starttls_required=false
zmlocalconfig -e ldap_starttls_supported=0
zmcontrol restart

Once the certificates are re-deployed then enable TLS on the LDAP server again.

zmlocalconfig -e ldap_starttls_required=true
zmlocalconfig -e ldap_starttls_supported=1
zmcontrol restart
Submitted by: Samrat Sarkar
Verified Against: ZCS 8.8.x, 9.0 Date Created: 2020-06-01
Article ID: https://wiki.zimbra.com/index.php?title=Root_CA_certificate_has_expired Date Modified: 2020-06-02

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