How to set the minimum protocol for openldap client connection

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Environment

SUSE Linux Enterprise Server 11

Situation

LDAP server requires a minimum of TLSv1 for a client connection.

Connection is disconnected after openldap client sends an SSLv2 Hello

Some servers do not negotiate to a higher protocol but will immediately close the connection if a lower protocol connection is initiated.

Default openldap client configuration.

Resolution

On SLES 11, the openldap client can set TLS_PROTOCOL_MIN in the /etc/openldap/ldap.conf file. This setting takes the following values: a.b where a=major version and b=minor version. EX: if a=2 then SSLv2 and up will be supported. If a=3 then TLSv1

For more information, see the discussion at http://www.openldap.org/its/index.cgi/Software%20Enhancements?id=5655

Additional Information

Documentation update has been requested to include information about the use of this parameter.

Disclaimer

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