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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



APPLIES TO

  • Microsoft Mail Gateway to SMTP 3.0



This article was previously published under Q102107

SUMMARY

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

STATUS

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 www.microsoft.com 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)


ftp ftp.microsoft.com
Change to the Softlib/Mslfiles folder.
Get SMTPGW.EXE

  • 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


MORE INFORMATION

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

$ telnet 128.227.212.10 25
Trying...
Connected to 128.227.212.10.
Escape character is '^]'.
220 yourhost.yourdomain.com running IBM VM SMTP V2R2 on Fri, 19 Mar 93
12:19:29 EST
HELO
501 Syntax Error. Domain name missing
helo myhost.mydomain.com
250 yourhost.yourdomain.com is my domain name.
quit
221 yourhost.yourdomain.com IBM VM SMTP V2R2 closing connection
Connection closed by foreign host.



Additional query words: 3.00

Keywords: KB102107