IIS and SMTP - 21 NOOP'S = 421 error Win2k

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Author 21 NOOP'S = 421 error Win2k
Robert Simpson

2004-06-26, 10:16 am

Someone want to explain why NOOP's are tagged as errors in the ESMTP
service?

220 master Microsoft ESMTP MAIL Service, Version: 5.0.2195.6713 ready at
Thu, 24 Jun 2004 09:25:30 -0700
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
NOOP
250 2.0.0 OK
421 Too many errors on this connection---closing


Robert Simpson

2004-06-26, 10:16 am

I can understand if one wants to prevent one's mailserver from a DoS by
limiting the NOOP's but you really should reset the counter after a
legitimate e-mail is processed.

Robert


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