How to disable TLSv1

Revision as of 15:00, 31 March 2021 by King0770 (talk | contribs) (How to disable TLSv1)

How to disable TLSv1

   KB 23852        Last updated on 2021-03-31  

(one vote)


The purpose of this article is to show how to disable TLSv1 on Zimbra server.


There are couple of components for which we can disable TLSv1:

1. Disable TLSv1 for proxy server/s:

$ zmprov mcf -zimbraReverseProxySSLProtocols TLSv1
$ zmproxyctl restart

2. Disable TLSv1 in Jetty for HTTPS, IMAPS, POP3S, and STARTTLS (including LMTP)

$ zmprov ms `zmhostname` -zimbraMailboxdSSLProtocols TLSv1 
$ zmmailboxdctl restart

3. Disable TLSv1 for ports 465, 587 and 25:

$ zmprov mcf zimbraMtaSmtpTlsProtocols '!SSLv2,!SSLv3,!TLSv1'
$ zmprov mcf zimbraMtaSmtpdTlsProtocols '!SSLv2,!SSLv3,!TLSv1'
$ zmprov mcf zimbraMtaSmtpTlsMandatoryProtocols '!SSLv2,!SSLv3,!TLSv1' 
$ zmprov mcf zimbraMtaSmtpdTlsMandatoryProtocols '!SSLv2,!SSLv3,!TLSv1' 
$ zmmtactl restart

These same commands can be used to disable also TLSv1.1 if needed.

As an option, use nmap to check what protocols are active.

nmap --script ssl-enum-ciphers -p 443

Verified Against: Zimbra Collaboration 8.8.11, 8.8.12 Date Created: 15/05/2019
Article ID: Date Modified: 2021-03-31

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Wiki/KB reviewed by SME1 SME2 COPY EDITOR Last edit by King0770
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