IIS FTP Server Users May Experience Delayed Responses (147191)
The information in this article applies to:
- Microsoft Internet Information Server 1.0
This article was previously published under Q147191 We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site: SYMPTOMS
Microsoft Internet Information Server FTP clients experience delayed
responses to commands when a large number of users are logged on through
FTP. This symptom occurs sporadically. File transfer speeds are not
affected.
CAUSE
The default number of threads per processor (MaxPoolThreads) installed on
your system is 10. This may be not be sufficient for a heavily used FTP
server because some of the FTP commands use synchronous I/O, causing
threads to block while they complete.
RESOLUTION
To allow more processor threads for IIS FTP clients , do the following in
the registry.
WARNING: Using Registry Editor incorrectly can cause serious, system-wide
problems that may require you to reinstall Windows NT to correct them.
Microsoft cannot guarantee that any problems resulting from the use of
Registry Editor can be solved. Use this tool at your own risk.
- Start Registry Editor (REGEDT32.EXE) and locate the following Registry
subkey in the HKEY_LOCAL_MACHINE subtree:
\SYSTEM\CurrentControlSet\Services\InetInfo\Parameters
- From the Edit menu, select Add Value.
- Enter the following:
Value Name: MaxPoolThreads
Data Type: REG_DWORD
String: <Range is 0 to 0xFFFFFFFF>
NOTE: A twin processor with 500 to 1000 concurrent users may require 50
or more threads per processor to provide quick response for all FTP
client users.
- Choose OK and quit the Registry Editor.
- Shut down and restart Windows NT.
STATUS
Microsoft has confirmed this to be a problem in Internet Information Server
version 1.0. We are researching this problem and will post new information
here in the Microsoft Knowledge Base as it becomes available.
Modification Type: | Minor | Last Reviewed: | 6/23/2005 |
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Keywords: | kbnetwork KB147191 |
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