COM Version 1.4 for OpenVMS
(July 22, 2004)
Security Patch Kits for COM and RPC
(September 19, 2003)
HP is pleased to provide you with a new
customer release version of COM for HP OpenVMS.
(Version 1.4 requires OpenVMS Alpha Version 7.3-1 or higher.)
COM Version 1.3 for HP OpenVMS is no longer available
due to third-party legal dependencies. If you are currently using COM Version 1.3,
you may continue to use it and submit problem reports via your service contract.
Important: A potential denial of service has been identified on OpenVMS systems
that have the DCE or COM layered products installed, or that are using
the RPC portion of DCE that ships with the OpenVMS operating system.
These OpenVMS systems could be vulnerable to a remote initated Buffer Overflow,
resulting in a hang of DCE or COM applications on OpenVMS.
Download and install both required patch kits
for all versions of COM running on OpenVMS Alpha Versions 7.2-2, 7.3, and 7.3-1.
for more information.
COM for OpenVMS pages:
COM (Component Object Model) is a technology from Microsoft® that allows
developers to create
distributed network objects. The former Digital Equipment Corporation and Microsoft
jointly developed the COM specification. First released as
NetOLE (Network Object Linking and Embedding) and then renamed DCOM (Distributed COM),
the COM specification now includes network
objects. COM for OpenVMS is a port of the Microsoft code that implements the COM and
DCOM draft standards.
» Download COM
» Frequently Asked Questions
» System Requirements
The COM for OpenVMS kit includes all the code and documentation you need to install
COM for OpenVMS on your system and to develop COM applications.
COM for OpenVMS supports full NTLM authentication between
OpenVMS and Windows NT/Windows 2000.
COM for OpenVMS requires
Version 7.3-1 or higher on an AlphaTM
Windows NT 4.0 SP5 or
Windows 2000 SP4 or higher.
New Features in Version 1.4
COM Version 1.4 provides an optimized implementation of the
underlying Win32 API infrastructure used by the COM runtime.
COM Version 1.4 for OpenVMS also fixes a number of problems in previous versions.
For a list of problems fixed in the current release, see
Problems Fixed in This Release.
COM for OpenVMS Security Options
COM for OpenVMS provides the user with two options for security:
unauthenticated COM and authenticated COM. These two forms of security are
defined as follows:
- Authenticated COM - The COM server process can execute in the
security context of the requesting Windows NT/Windows 2000 client.
The COM for OpenVMS server process includes Windows NT/Windows 2000
credentials that OpenVMS can use for OpenVMS Registry access and
outbound COM requests. Authenticated COM utilizes the
implementation of NTLM security on OpenVMS.
- Unauthenticated COM - The COM process is executed with an OpenVMS
security identity only; OpenVMS does not authenticate COM requests
from Windows NT/Windows 2000 clients or process any Windows NT/Windows