Article ID: 939321 - View products that this article applies to.
Important This article contains information that shows you how to help lower security settings or how to turn off security features on a computer. You can make these changes to work around a specific problem. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this workaround in your particular environment. If you implement this workaround, take any appropriate additional steps to help protect the computer.
You use Microsoft Office Outlook 2007 on a computer that is running Windows Vista. When you try to connect to a computer that is running Microsoft Exchange Server 2003, you receive the following error message:
Task reported error 0x8004011D. The server is not available. Contact your administrator if this condition persists.
Task 'firstname.lastname@example.org - Sending' reported error (0x80040115) : 'The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.'
This problem occurs if the destination port to which Outlook 2007 connects is TCP port 1723. For example, this problem occurs if the Microsoft Exchange Information Store service is configured to listen on port 1723.
In Windows Vista, client programs may be unable to connect to server services that listen on TCP port 1723. This problem occurs because Windows Vista determines that all outgoing traffic on TCP port 1723 is traffic for a point-to-point tunneling protocol (PPTP) VPN connection. The Windows Firewall service includes a stateful PPTP protocol analyzer which can reject traffic over TCP port 1723 under certain conditions.
Warning This workaround may make a computer or a network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.
To work around this problem, follow these steps:
Article ID: 939321 - Last Review: October 25, 2007 - Revision: 1.2