Microsoft KB Archive/290872

= XCCC: Cannot Schedule a Resource Anonymously =

Article ID: 290872

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange 2000 Conferencing Server

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This article was previously published under Q290872



SYMPTOMS
When you try to schedule a resource anonymously, you may receive the following error message in the browser window:

Access Denied

You do not have permission to schedule this resource.

Please try the following:

Schedule a different resource for the meeting.

If you are unable to schedule any of the available resources, contact your system administrator.

/ [Sending the message] Error #8004200A: / [Unable to schedule the specified conference.]

Microsoft Exchange 2000 Conferencing Server



CAUSE
This issue may occur if the Exchange Server administrator did not configure the Resource Calendar object for anonymous access. In Exchange Conferencing Server Service Pack 1 (SP1), anonymous users can use the new Web interface to schedule online conferences. However, for security reasons, the resources do not allow anonymous scheduling by default.



RESOLUTION
To resolve this issue if you are an Exchange Server administrator, enable anonymous scheduling for selected resources. To do so, log on to the resource mailbox and then give anonymous users Author permissions to the resource calendar as noted below.

WARNING: If you enable anonymous scheduling, you may allow a malicious user to initiate a Denial of Service (DoS) attack by creating large number of recurring meetings, which creates delays for Conference Management Service (CMS) queries.

NOTE: In order to set 'Default=Author' permissions on resource mailboxes to allow anonymous scheduling, Exchange 2000 Server SP1 (not to be confused with Conferencing Server SP1) must be installed on the Exchange Server where the resource mailboxes are homed.
 * 1) Log on to a computer as one of the resources, and then create a profile for the resource mailbox.

Alternatively, add the resource mailboxes to your existing profile.
 * 1) Right-click the Calendar object, and then click Properties.
 * 2) Click the Permissions tab, and then give anonymous users Author permissions.
 * 3) Restart the Microsoft Exchange Conferencing Service.
 * 4) Schedule a resource anonymously to verify that Anonymous scheduling of this resource works.

If you do not know the resource mailbox logon name:  Start Exchange System Manager. Browse to the following location, right-click Conferencing, and then click Manage:

Administrative Groups/Administrative Group/Conferencing

 Click the appropriate Exchange Conferencing Management site, and then click OK. Right-click the Conferencing site, click Properties, and then click the Resources tab.

The conference resource mailboxes that are already created are displayed.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Exchange 2000 Conferencing Server Service Pack 1.

Additional query words: MCU CMS esm conference server exch2kp2w

Keywords: kbbug kberrmsg kbfix KB290872

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