SecurityContext Class

Represents the security context for a message in a queue.

Namespace: System.Messaging
Assembly: System.Messaging (in system.messaging.dll)

public sealed class SecurityContext : IDisposable
public final class SecurityContext implements IDisposable
public final class SecurityContext implements IDisposable
Not applicable.

The security context contains cached security information such as an internal certificate, the corresponding private key, the user's SID, needed to attach a certificate and the sender identifier to a message when requesting authentication.

If a client, such as an ASP.NET application, impersonates a user to send a message to a queue, the identity of the user is used to access the queue. If the queue is remote, these credentials are cached and used for messages that are subsequently sent to the queue. Therefore, the SID in subsequent messages will be the cached identity of the first user that sent a message to the queue. The cached identity of the first user that sent a message to the queue will be used for subsequent users.

To overcome this problem, set the security context using SecurityContext before sending a message to a remote queue to ensure that the current user's credentials are used to gain access to the queue. However, the suggested best practice is to:

  1. Make the queue an authenticated queue.

  2. Run the ASP.NET application as a domain identity and authorize that application to write to the queue.

  3. Do not impersonate the user when using the queue. Instead, get the caller’s identity and either perform authorization checking in the ASP.NET application or include the caller’s identity as part of the message and perform authorization checking in the receiver application.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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