ClientCertificates Property

FtpWebRequest.ClientCertificates Property


Gets or sets the certificates used for establishing an encrypted connection to the FTP server.

Namespace:   System.Net
Assembly:  System (in System.dll)

public X509CertificateCollection ClientCertificates { get; set; }

Property Value

Type: System.Security.Cryptography.X509Certificates.X509CertificateCollection

An X509CertificateCollection object that contains the client certificates.

Exception Condition

The value specified for a set operation is null.

Client certificates are used to authenticate the client during the initial SSL connection negotiation. For more information, see EnableSsl.


The .NET Framework caches SSL sessions as they are created and attempts to reuse a cached session for a new request, if possible. When attempting to reuse an SSL session, the .NET Framework uses the first element of ClientCertificates (if there is one), or tries to reuse an anonymous session if ClientCertificates is empty.


The .NET Framework attempts to reuse an SSL session only if a client certificate is not required.

.NET Framework
Available since 2.0
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