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Microsoft KB Archive/102107

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Knowledge Base

SMTP: Err Msg: ERROR Network_Read: Lost Network Connection

Article ID: 102107

Article Last Modified on 10/30/2006


  • Microsoft Mail Gateway to SMTP 3.0

This article was previously published under Q102107


When a connection begins for the Microsoft Mail Gateway to SMTP, the first thing that occurs is a greeting exchange between the TCP/IP host and the SMTP gateway computer. RFC 822 specifies that these greeting replies include host names. However, the SMTP gateway does not include the host names in its greeting replies. Most hosts ignore this particular piece of the 822 RFC.

When communicating with an IBM VM host running IBM VM SMTP V2R2, an error may occur because IBM VM requires that the host name be included. As a result, the gateway log file, SMTPGATE.LOG, will record the following error message:

ERROR Network_read: Lost network connection


Microsoft has confirmed this to be problem in version 3.0 of Microsoft Mail Gateway to SMTP. This problem was corrected in version 3.0.1 of SMTPGATE.EXE. If you do not have version 3.0.1 (or later), you can obtain the latest version from the Microsoft Software Library (MSL). Download SMTPGW.EXE (S14223), a self-extracting file, from any of the following services:

  • Microsoft's World Wide Web Site on the Internet

On the home page, click the Support icon.
Click Knowledge Base, and select the product.
Enter kbfile SMTPGW.EXE, and click GO!
Open the article, and click the button to download the file.

  • Internet (anonymous FTP)

Change to the Softlib/Mslfiles folder.

  • The Microsoft Network

On the Edit menu, click Go To, and then click Other Location.
Type mssupport.
Double-click the MS Software Library icon.
Find the appropriate product area.
Locate and Download SMTPGW.EXE.

For additional information about downloading, please see the following article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services


The following is an example of what happens when you connect to the IBM VM host with a telnet session on port 25:

$ telnet 25
Connected to
Escape character is '^]'.
220 running IBM VM SMTP V2R2 on Fri, 19 Mar 93
12:19:29 EST
501 Syntax Error. Domain name missing
250 is my domain name.
221 IBM VM SMTP V2R2 closing connection
Connection closed by foreign host.

Additional query words: 3.00

Keywords: KB102107