COSERVERINFO structure (objidl.h)

Identifies a remote computer resource to the activation functions.


typedef struct _COSERVERINFO {
  DWORD      dwReserved1;
  LPWSTR     pwszName;
  COAUTHINFO *pAuthInfo;
  DWORD      dwReserved2;



This member is reserved and must be 0.


The name of the computer.


A pointer to a COAUTHINFO structure to override the default activation security for machine remote activations. Otherwise, set to NULL to indicate that default values should be used. For more information, see the Remarks section.


This member is reserved and must be 0.


The COSERVERINFO structure is used primarily to identify a remote system in object creation functions. Computer resources are named using the naming scheme of the network transport. By default, all UNC ("\\server" or "server") and DNS names ("", "", or "") names are allowed.

If pAuthInfo is set to NULL, Snego will be used to negotiate an authentication service that will work between the client and server. However, a non-NULLCOAUTHINFO structure can be specified for pAuthInfo to meet any one of the following needs:

  • To specify a different client identity for computer remote activations. The specified identity will be used for the launch permission check on the server rather than the real client identity.
  • To specify that Kerberos, rather than NTLMSSP, is used for machine remote activation. A nondefault client identity may or may not be specified.
  • To request unsecure activation.
  • To specify a proprietary authentication service.
If pAuthInfo is not NULL, those values will be used to specify the authentication settings for the remote call. These settings will be passed to the RpcBindingSetAuthInfoEx function.

If the pAuthInfo parameter is NULL, then dwAuthnLevel can be overridden by the authentication level set by the CoInitializeSecurity function. If the CoInitializeSecurity function isn't called, then the authentication level specified under the AppID registry key is used, if it exists.

Starting with Windows XP with Service Pack 2 (SP2), dwAuthnLevel is the maximum of RPC_C_AUTHN_LEVEL_CONNECT and the process-wide authentication level of the client process that is issuing the activation request. For earlier versions of the operating system, this is RPC_C_AUTHN_LEVEL_CONNECT.


Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps | UWP apps]
Minimum supported server Windows 2000 Server [desktop apps | UWP apps]
Header objidl.h (include Objidl.h)

See also

Activation Security






Turning Off Activation Security