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Httperr.log: xxx_Connections_Refused

  
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Author Message
camos

External


Since: Feb 22, 2008
Posts: 2



(Msg. 1) Posted: Fri Feb 22, 2008 12:04 pm
Post subject: Httperr.log: xxx_Connections_Refused
Archived from groups: microsoft>public>inetserver>iis (more info?)
On Windows Server 2003:



I implement an ISAPI extension which proxy's http-Request from an Internet
browser to our application backend. It works fine under low but breaks under
"heavy" load.



To verify this I started 100 clients from one Server (one IP-Address). Each
one creates one request per 10 seconds. These clients run well for 8 hours.
After 8 hours all clients receive errorcode 12031 from the IIS. There is no
obvious reason for this: nothing changes in the infrastructure.



IIS now logs a lot of the following lines:



2008-02-22 11:00:41 - - - - - - - - - 124_Connections_Refused -

2008-02-22 11:00:46 - - - - - - - - - 130_Connections_Refused -


2008-02-22 11:01:21 - - - - - - - - - 125_Connections_Refused -

.... more of this to follow, repeated until now




The client -accidently, I will change this to 10 retries- keeps firing
connection requests: probably all together 120 per 5 seconds.



But why does IIS reject it. I cannot make any connection to port 80 on the
IIS. Is this to a kind of DOS defense?



Thank you for your help.

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"Lognoul, Marc

External


Since: Feb 05, 2008
Posts: 21



(Msg. 2) Posted: Fri Feb 22, 2008 12:04 pm
Post subject: Re: Httperr.log: xxx_Connections_Refused [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
This is not a DOs defense but IIS resources wasted. See details here:
http://blogs.msdn.com/david.wang/archive/2005/09/21/HOWTO-Diagnose-IIS...ailing-

Marc

<camos RemoveThis @noemail.noemail> wrote in message
news:uhNVknUdIHA.2404@TK2MSFTNGP05.phx.gbl...
> On Windows Server 2003:
>
>
>
> I implement an ISAPI extension which proxy's http-Request from an Internet
> browser to our application backend. It works fine under low but breaks
> under
> "heavy" load.
>
>
>
> To verify this I started 100 clients from one Server (one IP-Address).
> Each
> one creates one request per 10 seconds. These clients run well for 8
> hours.
> After 8 hours all clients receive errorcode 12031 from the IIS. There is
> no
> obvious reason for this: nothing changes in the infrastructure.
>
>
>
> IIS now logs a lot of the following lines:
>
>
>
> 2008-02-22 11:00:41 - - - - - - - - - 124_Connections_Refused -
>
> 2008-02-22 11:00:46 - - - - - - - - - 130_Connections_Refused -
>
>
> 2008-02-22 11:01:21 - - - - - - - - - 125_Connections_Refused -
>
> ... more of this to follow, repeated until now
>
>
>
>
> The client -accidently, I will change this to 10 retries- keeps firing
> connection requests: probably all together 120 per 5 seconds.
>
>
>
> But why does IIS reject it. I cannot make any connection to port 80 on the
> IIS. Is this to a kind of DOS defense?
>
>
>
> Thank you for your help.
>
>

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WenJun Zhang[msft]

External


Since: Dec 16, 2005
Posts: 229



(Msg. 3) Posted: Mon Feb 25, 2008 6:16 am
Post subject: Re: Httperr.log: xxx_Connections_Refused [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Hi,

The error occurs when kerneal NonPagedPool memory is below 20MB, http.sys
will stop to accept new requests at that time. The resolution and work
around of this issue are documented in the following article. If /3GB
switch is enabled, please consider removing it from boot.ini and monitor if
the problem still persists. Also adding EnableAggressiveMemoryUsage
registry key will give http.sys 12MB additional NonPagedPool quota. If
still no avail, you need to check if there are any potential defected
applications will cause kernel memory leak on your server.

Error message when you try to view a Web page that is hosted on IIS 6.0:
"Page cannot be displayed"
http://support.microsoft.com/default.aspx?scid=kb;EN-US;933844

Please update here on any further issue.

Have a great week.

Sincerely,

WenJun Zhang

Microsoft Online Community Support

==================================================

Get notification to my posts through email? Please refer to:
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.

Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at:

http://msdn.microsoft.com/subscriptions/support/default.aspx.

==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.
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WenJun Zhang[msft]

External


Since: Dec 16, 2005
Posts: 229



(Msg. 4) Posted: Thu Feb 28, 2008 1:37 pm
Post subject: Re: Httperr.log: xxx_Connections_Refused [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Hi,

Is there any update of this issue?

Thanks.

Sincerely,

WenJun Zhang

Microsoft Online Community Support

==================================================

Get notification to my posts through email? Please refer to:
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.

Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at:

http://msdn.microsoft.com/subscriptions/support/default.aspx.

==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.
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camos

External


Since: Feb 22, 2008
Posts: 2



(Msg. 5) Posted: Wed Mar 05, 2008 1:24 pm
Post subject: Re: Httperr.log: xxx_Connections_Refused [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Sorry for my late reply,

I gave my thanks to the group through the web-browser, but this post is
missing...

I want to say thank you again: I found the problem. It was the nonpaged
memory pool. I created threads without closing the thread's handle.





""WenJun Zhang[msft]"" <wjzhang DeleteThis @online.microsoft.com> schrieb im Newsbeitrag
news:8eDqk44dIHA.4720@TK2MSFTNGHUB02.phx.gbl...
> Hi,
>
> The error occurs when kerneal NonPagedPool memory is below 20MB, http.sys
> will stop to accept new requests at that time. The resolution and work
> around of this issue are documented in the following article. If /3GB
> switch is enabled, please consider removing it from boot.ini and monitor
if
> the problem still persists. Also adding EnableAggressiveMemoryUsage
> registry key will give http.sys 12MB additional NonPagedPool quota. If
> still no avail, you need to check if there are any potential defected
> applications will cause kernel memory leak on your server.
>
> Error message when you try to view a Web page that is hosted on IIS 6.0:
> "Page cannot be displayed"
> http://support.microsoft.com/default.aspx?scid=kb;EN-US;933844
>
> Please update here on any further issue.
>
> Have a great week.
>
> Sincerely,
>
> WenJun Zhang
>
> Microsoft Online Community Support
>
> ==================================================
>
> Get notification to my posts through email? Please refer to:
>
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
> ications.
>
> Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
> where an initial response from the community or a Microsoft Support
> Engineer within 1 business day is acceptable. Please note that each follow
> up response may take approximately 2 business days as the support
> professional working with you may need further investigation to reach the
> most efficient resolution. The offering is not appropriate for situations
> that require urgent, real-time or phone-based interactions or complex
> project analysis and dump analysis issues. Issues of this nature are best
> handled working with a dedicated Microsoft Support Engineer by contacting
> Microsoft Customer Support Services (CSS) at:
>
> http://msdn.microsoft.com/subscriptions/support/default.aspx.
>
> ==================================================
>
> This posting is provided "AS IS" with no warranties, and confers no
rights.
>
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WenJun Zhang[msft]

External


Since: Dec 16, 2005
Posts: 229



(Msg. 6) Posted: Thu Mar 06, 2008 10:08 am
Post subject: Re: Httperr.log: xxx_Connections_Refused [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
That's great the problem has been resolved. If you meet any other IIS
related issues in future, please don't hesitate to post here again.

You are always welcome.

Sincerely,

WenJun Zhang

Microsoft Online Community Support

==================================================

Get notification to my posts through email? Please refer to:
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.

Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at:

http://msdn.microsoft.com/subscriptions/support/default.aspx.

==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.
 >> Stay informed about: Httperr.log: xxx_Connections_Refused 
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