Unable to get issuer certificate

'OpenSSL Validating Certificate Path' tutorial was cited in a Zimbra wiki article in 2012.

The OpenSSL Validating Certificate Path tutorial was cited in a Zimbra wiki article in 2012.

Subject: Unable to get issuer certificate
Date: Jul 5, 2012
Author: zimbra.com
Source: https://wiki.zimbra.com/wiki/Unable_to_get_issuer_certificate

If you are getting this error as you deploy the certificate: 
   XXXXX ERROR: Invalid Certificate:....error 20 at 0 depth lookup:unable 
      to get local issuer certificate
   XXXXX ERROR: provided cert isn't valid. 

or this error, 
   this alternate error error 2 at 1 depth lookup

it means the certificate path or chain is broken and you are missing 
certificate files. In most cases the intermediate cert is the path 
or chain that is affected. 

For more info on certificate path verification, please take a look 
at http://www.herongyang.com/crypto/openssl_verify.html. 

For more zimbra specific details and discussion see 

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