Authentication servers are the external sources of user accounts for UserGate, e.g. LDAP servers, Radius, TACACS+, Kerberos or SAML. UserGate supports:
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LDAP-connector
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Radius authentication server
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TACACS+ authentication server
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Kerberos authentication server
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NTLM authentication server
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SAML (SSO) authentication server
The Radius, TACACS+, NTLM, SAML and Kerberos authentication servers can only authorize users, while the LDAP-connector can provide information about users and their properties.