I am using CentOS 5 with Apache2.

Into an additional config file:


I have put these lines:

SSLHonorCipherOrder On 
SSLProtocol all -SSLv2 -SSLv3 -TLSv1 -TLSv1.1 

I still can't enable TLSv1.3. The error says when restarting the service

Starting httpd: Syntax error on line 113 of /etc/apache2/conf/extra/ssl.conf: 
SSLProtocol: Illegal protocol 'TLSv1.3'

System: CentOS 5.11 (Final).

OpenSSL: 1.1.1a 20 Nov 2018.

  • 3
    Can you provide the version details for your OS, Apache & OpenSSL?
    – Haxiel
    Jan 22, 2019 at 11:07
  • Did you show us line 113? I don't see a TLSv1.3 entry...?
    – Jeff Schaller
    Jan 22, 2019 at 11:22
  • Centos 5 is too old to support that, I think. What have you installed? Jan 22, 2019 at 13:48
  • hi, my OS is CentOS release 5.11 (Final). Openssl is OpenSSL 1.1.1a 20 Nov 2018
    – jonathan
    Jan 28, 2019 at 10:41
  • @JeffSchaller .. the error is when i put the SSLProtocol TLSv1.3
    – jonathan
    Jan 28, 2019 at 10:44

1 Answer 1


Note that you would need the very latest Apache version in order for the following to work:

SSLProtocol -all +TLSv1.3 +TLSv1.2

This is simpler than disabling all of the other obsolete protocols.

And then you need to define pre-TLSv1.3 cipher suites separately. Like so:

SSLCipherSuite    TLSv1.3   TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256
  • thanks for your respond. but after I added the suggested lines, got error: Starting httpd: Syntax error on line 108 of /etc/apache2/conf/extra/ssl.conf: SSLProtocol: Illegal protocol 'TLSv1.3' [FAILED] can you help me out of this. I appreciates much.
    – jonathan
    Jan 28, 2019 at 11:30
  • @jonathan.rtz Post your openssl version. Jan 28, 2019 at 13:08
  • here it is my OS is CentOS release 5.11 (Final). Openssl is OpenSSL 1.1.1a 20 Nov 2018
    – jonathan
    Jan 29, 2019 at 1:56
  • ok. thank you! i will wait. thanks again.
    – jonathan
    Jan 29, 2019 at 7:57
  • Is there any configuration that I should add or maybe I miss out in my ssl.conf? TSL1.3 is still disabled.
    – jonathan
    Jan 31, 2019 at 3:54

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