Unable to create a successful TLS connection to the ldap masters

When upgrading to 8.5x, "Unable to create a successful TLS connection to the ldap masters" comes up


When upgrading from 7.x or 8.0.x to 8.5+, the upgrade stops with the error :

Unable to create a successful TLS connection to the ldap masters.
Fix cert configuration prior to upgrading


To fix this, any one of the following can be tried :

Using a commercial certificate

If there is a valid commercial certificate, like a wild card one, just deploying that on all the nodes will fix the error.

Deploying a certificate using the LDAP's CA

a. Copy the CA from the ldap server to the other servers :

rsync -Pa /opt/zimbra/ssl/zimbra/ca/ root@otherserver.example.com:/opt/zimbra/ssl/zimbra/ca/

b. Deploy this CA on the other servers :

/opt/zimbra/bin/zmcertmgr deployca

c. Recreate and redeploy the self-signed cert on the other servers :

/opt/zimbra/bin/zmcertmgr createcrt -new -days 3650
/opt/zimbra/bin/zmcertmgr deploycrt self

The certificates now will be created using the LDAP's newly deployed CA, so the ldap should recognize these as valid certificates now.

This would be the best way to do it if self-signed certificates are used.

Disabling all TLS connections

Run this on the ldap and proxy servers before the upgrade

su - zimbra 
zmlocalconfig -e ssl_allow_untrusted_certs=true 
zmlocalconfig -e ldap_starttls_supported=0
zmlocalconfig -e ldap_starttls_required=false
zmlocalconfig -e ldap_common_require_tls=0
zmcontrol restart

After the upgrade is done, a new self-signed CA and certificate can be deployed across the environment, and then TLS can be enabled again by flipping the values for the above.

Submitted by: "Shashank Tewari"

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