Applications that require DCOM cannot connect to network resources after Windows Live OneCare is installed (913735)
The information in this article applies to:
SYMPTOMSWhen you run an application that requires DCOM on a computer
that has Microsoft Windows Live OneCare installed, you may receive an error
message. The error message states that the application cannot connect to
network resources.
Note The error message varies depending on the application you are
running.CAUSEThis problem may occur when Windows OneCare Firewall is
enabled. By default, Windows OneCare Firewall blocks port 135. This port is
required by DCOM.RESOLUTIONImportant These steps may increase your security risk. These steps may also
make your computer or your network more vulnerable to attack by malicious users
or by malicious software such as viruses. We recommend the process that this
article describes to enable programs to operate as they are designed to, or to
implement specific program capabilities. Before you make these changes, we
recommend that you evaluate the risks that are associated with implementing
this process in your particular environment. If you choose to implement this
process, take any appropriate additional steps to help protect your system. We
recommend that you use this process only if you really require this
process. To resolve this issue, follow these steps to
open port 135:
- In the Windows OneCare display, click View or
change settings.
- Click the Firewall tab.
- Under Other settings, click
Advanced Settings.
- Click the Ports and Protocols
tab.
- Click Add.
- In the Name box, type
DCOM.
- Under Protocol, click TCP or
UDP.
- In the TCP or UDP list, click
TCP.
- In both Port Range boxes, type
135.
- In the Direction box, click
Inbound under Settings.
- Under Scope, click
Internet.
- Click OK two times.
MORE INFORMATIONApplications that require DCOM must query the Svchost.exe
process to open port 135 for listening. However, when Windows Live OneCare Firewall
is enabled, the Svchost.exe process does not have permission to open port 135.
Windows Live OneCare Firewall blocks DCOM because some viruses can take advantage of
vulnerabilities in DCOM. For the same reason, Windows Live OneCare Firewall does not
let you add the Svchost.exe process to the exception list.REFERENCESFor more information about DCOM, visit the following
Microsoft Web site: For more
information about the Svchost.exe process, click the following article numbers
to view the articles in the Microsoft Knowledge Base: 250320
Description of Svchost.exe in Windows 2000
314056 A
description of Svchost.exe in Windows XP Pro
Modification Type: | Major | Last Reviewed: | 5/23/2006 |
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Keywords: | kbprb kbtshoot KB913735 kbAudEndUser |
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