cyradm TLS issues

SYSTEM INFORMATION:
OS: CentOS 7
Cyrus-Imap: RPM = cyrus-imapd-2.4.17-15.el7.x86_64

TLS CONFIGURATION:
tls_cert_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem
tls_key_file: /etc/pki/cyrus-imapd/cyrus-imapd.key
tls_ca_file: /etc/pki/tls/certs/ca-bundle.crt
tls_cipher_list:
HIGH:!aNULL:!eNULL:!LOW:!MD5:!EXPORT:!DES:!3DES:!RC4:@STRENGTH
tls_prefer_server_ciphers: 1
tls_versions: tls1_2
#tls_versions: tls1_0 tls1_1 tls1_2

PROBLEM:
When I attempt to login using cyradm I get SSL/TLS errors. The only way I
have been able to get this to work was to enable TLS version 1.0. Security
team won't allow less than TLS1.2 and I am not able to move to a newer OS
at this time. Is there a way to get it working on CentOS 7 with TLSv1.2 or
later? Maybe I need different ciphers?

If I uncomment the last line I am able to connect and login.
tls_versions: tls1_0 tls1_1 tls1_2

ERRORS:
:~$ cyradm --user cyrus --tlskey --auth plain  localhost
[ SSL_connect error -1 ]
[ SSL session removed ]
[ TLS negotiation did not succeed ]

LOGS: With only TLSv1.2 enabled
imap[]: STARTTLS negotiation failed: localhost [127.0.0.1]

LOGS: With TLSv1.0 enabled
imap[]: starttls: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits new)
no authentication


Any assistance is appreciated.
--Ez

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