DOCUMENT:Q112237 30-OCT-1999 [pcmail] TITLE :SMTP: ERROR Write and ERROR Read Messages PRODUCT :Microsoft Mail For PC Networks PROD/VER:MS-DOS:3.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Mail Gateway to SMTP, version 3.0 ------------------------------------------------------------------------------- SYMPTOMS ======== The Mail Gateway to SMTP displays "ERROR write" and "ERROR read" messages. CAUSE ===== There is a problem in the TCP/IP layer of the network transport. If no other errors indicate an obvious cause, the most common one is mismatched TCP/IP window sizes. RESOLUTION ========== Define the window sizes in the gateway computer's TCP/IP layer and the TCP/IP host to be in the same range. The best method is to make them the same size and the minimum size allowed. If window sizes match but network errors persist, use a protocol analyzer on the network segment between the gateway computer and the TCP/IP host to pinpoint their cause. REFERENCE KB on "TCP/IP Sliding Windows Concept" Additional query words: 3.00 smtp tcpip windows ====================================================================== Keywords : Technology : kbMailSearch kbMailGateSearch kbZNotKeyword3 kbMailGateSMTP300 Version : MS-DOS:3.0 ============================================================================= 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.