On 10 March 2020, Microsoft recommended to move to LDAP channel binding and LDAP signing to avoid replay attacks on the LDAP communication. After the hardening changes are done, Simple Authentication and Security Layer (SASL) LDAP binds that do not request signing (integrity verification) will be rejected by Active Directory domain controllers. Sophos UTM supports LDAP authentication over SSL/TLS to avoid man-in-the-middle attacks. This knowledge base article contains the necessary changes to the configuration. The following sections are covered:
Applies to the following Sophos products and versions Sophos UTM
To change the connection security for specific Authentication Servers, perform the following steps:
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