DOCUMENT:Q152666 19-DEC-1999 [exchange] TITLE :XCON: Messages In RAS Connector Queue NDR when Modem is Busy PRODUCT :Microsoft Exchange PROD/VER:winnt:4.0,5.0,5.5 OPER/SYS: KEYWORDS:kbusage exc4 exc5 exc55 ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Exchange Server, versions 4.0, 5.0, 5.5 ------------------------------------------------------------------------------- SYMPTOMS ======== When you send a message over the Microsoft Exchange Dynamic Remote Access Service (RAS) Connector, you might receive a Non-Delivery Report (NDR) after a specific period of time. The NDR will look like this: The following recipient(s) could not be reached: 'TO USER' on 6/14/96 1:35:13 PM The recipient could not be processed due to congestion in the message transfer service [MSEXCH:MSExchangeMTA:EXCHANGE:MAIL1] This can happen if the modem on the RAS server is in use by another RAS connection. WORKAROUND ========== There two ways to avoid this problem: - Schedule the Dynamic RAS Connector to dial out at predetermined time when the modem will be available. - Install another modem on the server. In the phone book entry for the Dynamic RAS connector, specify the new modem port or any available modem port. MORE INFORMATION ================ The Microsoft Exchange Message Transfer Agent (MTA) will try to send the message over the current RAS connection and this will fail. It will keep trying until the retry value set on the MTA override page for the RAS Connector has been exhausted. At this time, the MTA will send an NDR to you. This is by design. Additional query words: RAS NDR mta busy ====================================================================== Keywords : kbusage exc4 exc5 exc55 Technology : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2 Version : winnt:4.0,5.0,5.5 Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.