XCON: Exchange Server MTA Always Uses RTSE Window Size 3

When you connect Microsoft Exchange Server to other X.400 systems or to other Exchanger Servers computers via an X.400 connector, Exchange Server does not use a reliable transfer service element (RTSE) window size greater than 3. Exchange Server requests the window size is 3, even if the configuration in the MTA Override Property Page says 5 for example. If the connection is opened by another MTA, Exchange Server will negotiate the RTSE window size down to 3.

Exchange Server 5.0

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.

Exchange Server 5.5

To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For more information, please see the following article in the Microsoft Knowledge Base:

Exchange Server 5.0

Microsoft has confirmed this to be a problem in Exchange Server versions 5.0.

Exchange Server 5.5

Microsoft has confirmed this to be a problem in Exchange Server versions 5.5.This problem was first corrected in Exchange Server 5.5 Service Pack 2.

The new Exchange MTA will now use the RTSE window size as specified in the Exchange Server Administrator program.