• None: Do not request a certificate from the remote host, and accept any certificate if the host sends one.

  • Optional trusted: If the remote host sends a certificate, SSB checks if it is valid (not expired) and that the Common Name of the certificate contains the domain name or the IP address of the host. If these checks fail, SSB rejects the connection. However, SSB accepts the connection if the host does not send a certificate.

  • Optional untrusted: Accept any certificate shown by the remote host. Note that the host must show a certificate.

  • Required trusted (default setting): Verify the certificate of the remote host. Only valid certificates signed by a trusted certificate authority are accepted. See Uploading external certificates to SSB for details on importing CA certificates. Note that the Common Name of the certificate must contain the domain name or the IP address of the host.

  • Required untrusted: SSB requests a certificate from the remote host, and rejects the connection if no certificate is received. However, SSB accepts the connection if:

    • the certificate is not valid (expired), or

    • the Common Name of the certificate does not contain the domain name or the IP address of the host.