Microsoft KB Archive/168108

= XFOR: Smtpsvc Queue Processing Is Slow When DNS Lookup Fails =

Article ID: 168108

Article Last Modified on 11/7/2003

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APPLIES TO


 * Microsoft Commercial Internet System 1.0 Service Pack 2

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This article was previously published under Q168108





SYMPTOMS
This article applies to Microsoft Mail Server. The Internet Mail Server may process mail slowly resulting in a backup of mail in the mail queue as well as in the pickup directories. The queue directory will contain a large number of .rtr files which indicates that multiple Domain Name Service (DNS) retries have occurred.



CAUSE
Excessive DNS query failures cause mail processing to perform slowly because IMS continually attempts to resolve the names against the DNS. The DNS lookup attempts use a critical section to ensure mutual exclusion when running the DNS lookup code. This causes all other queue processing that requires DNS resolution to stop until the current DNS lookup is complete.



RESOLUTION
Smtpsvc.dll was modified to resolve contributing issues with the handling of DNS MX lookups, and the handling of DNS lookup retries.



STATUS
Microsoft has confirmed this to be a problem in Microsoft Commercial Internet System version 1.0. This problem has been corrected in the latest U.S. Service Pack for Microsoft Commercial Internet System version 1.0. For information on obtaining the Service Pack, query on the following article in the Microsoft Knowledge Base:

183062 MCIS 1.0 Service Packs 1 and 2 Information

Additional query words: sp2 ims mcis1sp2fix

Keywords: kbbug kbfix KB168108

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