Microsoft KB Archive/105289

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SMTP: Gateway Hangs Using Novell LAN Workplace for DOS

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Q105289

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The information in this article applies to:


 * Microsoft Mail Gateway to SMTP, version 3.0

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SYMPTOMS
The Microsoft Mail Gateway to SMTP may hang during message transmission when using Novell's TCP/IP product for the PC (LAN Workplace for DOS). This error appears:

ERROR write: (9) Bad file number

The following lines appear in the log file as errors when you use the -CD and -LACSY options with SMTPGATE. (NOTE: Each error appears on one on one long line in the log file; they are broken here due to formatting restrictions.)

[rx] 451 net hang reading from SMTP_GATEWAY_MACHINE: Connection timed out during HELO with SMTPSMART_HOST.

14:34:25 - ERROR Invalid response to MAIL: 451 net hang reading from SMTP_GATEWAY_MACHINE: Connection timed out during HELO with SMTP_ROUTER/HOST_MACHINE.

CAUSE
The way LAN Workplace for DOS handles IP fragmentation causes the SMTP Gateway layer to hang because it is waiting for a good packet of information to process and has no time-out limit for waiting.

RESOLUTION
To avoid this problem, either:


 * Upgrade to the latest version of LAN Workplace for DOS and apply all the necessary patches.
 * Configure LAN Workplace for DOS to use the smallest packet size available: 632. The default size is 2048.

Additional query words: 3.00 ErrMsg ERROR write: (9) Bad file number

Keywords :

Issue type :

Technology : kbMailSearch kbMailGateSearch kbZNotKeyword3 kbMailGateSMTP300