Knowledge Base

XCON: Remote X.400 MTA May Abort the Connection to Exchange

Article ID: 189754

Article Last Modified on 10/28/2006

Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q189754

SYMPTOMS

A third-party X.400 message transfer agent (MTA) may abort the connection to Microsoft Exchange Server after receiving an RTSE Open Accept frame.

CAUSE

The third-party MTA may try to open a connection to Microsoft Exchange Server via an X.400 link without specifying the parameter "Window Size." This parameter is optional in the RTSE Open Request frame. Microsoft Exchange Server answers with an RTSE Open Accept frame asking for a "Window Size" of 5. According to the X.228 specification, a "Window Size" of 3 has to be assumed if nothing else was specified in the RTSE Open Request.

STATUS

Microsoft has confirmed this to be a problem in Exchange Server version 5.5

A supported fix is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next service pack that contains this fix. Contact Microsoft Technical Support for more information.

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB189754