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I am trying to solve some performance problems.

We have a web server that calls another web server with WCF services installed.

There are about 20,000 calls in 1 hour, most are a few milliseconds.

But about 20 of them are 10 to 50 seconds

All of these have sc-win32-status 121 or 1236.

Question is what could be causing sc-win32-status 121 or 1236, and how could I solve this?

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are they with sc-status 200? –  Vivek Kumbhar Nov 15 '10 at 6:38
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1 Answer

up vote 2 down vote accepted

Could be a denial of service attack via and improperly set MinFileBytesPerSec metabase setting.

For details:

http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/0b447dba-6bcc-4238-a932-0e083170c3ab.mspx?mfr=true

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Thanks for the answer, it turned out that it was just normal use of the system with browser caching turned off –  Shiraz Bhaiji Nov 30 '10 at 7:56
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