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From: Peter Posselt Vestergaard <PPV@MILESTONE.DK>
To: users@httpd.apache.org
Date: Wed, 11 Feb 2004 14:27:18 +0100
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Subject: [users@httpd] Apache HTTP-server hangs on non-consuming client (was:
 RE: [users
	@httpd] apache http-server hangs on .smil,.rm,.swf request)
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Hi again
We have done some more testing and have found out the following:
It seems like the problem occurs when the client's window gets full. As
RealOne is not removing any packets from the window it is slowly filled and
eventually the TCP ACK messages returned from the client tells that its
window-size is 0. This causes Apache to start sending HTTP-packets of size
1, which the client TCP ACK's with window-size set to 0, etc. This is a
reasonable behaviour, but why does Apache stop handling other clients while
this is ongoing? 
We have tried installing Apache on a couple of Windows 2003 server machines
and here there is no problem - it only occurs on the XP's.
After the 'Timeout' (set in httpd.conf) period expires the server (of
course) again start working probably as the client is dropped.
We are only using two different client machines at a time (but have tried
several), so it should not be anything regarding some connection limitation
on Win XP (I think).
Is it a bug or am I doing something wrong?
Best regards
Peter Vestergaard

-----Original Message-----
From: Peter Posselt Vestergaard [mailto:PPV@MILESTONE.DK] 
Sent: 10. februar 2004 15:14
To: users@httpd.apache.org
Subject: [users@httpd] apache http-server hangs on .smil,.rm,.swf request



Hi list 
I am experiencing a weird problem that I have been unable to find any
information about, so now I turn to you. 
I have a freshly installed Apache HTTP-server v2.0.48 (win32-binary
downloaded from http://httpd.apache.org/download.cgi
<http://httpd.apache.org/download.cgi> ) running on a Windows XP
(single-processor). I have made no other configuration than what is done
during the install (Typical).

I have copied three files to the htdocs directory: one .smil, one .rm and
one .swf file. The .smil file references the two other file - I have put the
content of it in the bottom of this message.

On the client machines I am using RealOne Player v2.0 to access the .smil
file and it works fine. Untill I tried it on a machine with no sound card.
This made the Real Player pop up a dialog telling me a general error had
occured. This error was due to the missing sound card and sound in the .rm
file, but that is probably irrelevant.

The problem is that while the RealOne dialog is showing I cannot access any
pages on the Apache server from any machine! Not even the main test page
(telling that apache is installed), but as soon as I press OK in the dialog
the pages are served.

I have tried installing Apache on two different WinXP machines - the one
with almost nothing else installed - with the same result.

Anyone have a clue of what I do/ what is wrong? It is pretty scary to me
that one client can hang up the server like this...

Thanks in advance! 
Best regards 
Peter Vestergaard 

<smil xmlns="http://www.w3.org/2001/SMIL20/Language
<http://www.w3.org/2001/SMIL20/Language> " 
    xmlns:rn="http://features.real.com/2001/SMIL20/Extensions
<http://features.real.com/2001/SMIL20/Extensions> "> 
    <head> 
        <meta name="title"       content="Testing" />   
        <layout> 
            <root-layout backgroundColor="#E8EDF1" width="781" height="450"
rn:resizeBehavior="percentOnly"  /> 
            <region id="video" width="539" height="409" left="123" top="2"
fit="fill" z-index='31' /> 
            <region id="logo" width="90" height="78" left="10" top="1"
z-index='70' /> 
        </layout> 
    </head> 
    <body> 
          <par> 
                <animation src="mylogo.swf" region="logo" regPoint="center"
regAlign="center" begin="00:00.0" fill="freeze" />

                <video src="intro.rm" region="video" regPoint="middle"
begin="00:00.0"></video> 
          </par> 
    </body> 
</smil> 


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<TITLE>Message</TITLE>

<META content="MSHTML 6.00.2800.1400" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=156290713-11022004><FONT face=Arial color=#0000ff size=2>Hi 
again</FONT></SPAN></DIV>
<DIV><SPAN class=156290713-11022004><FONT face=Arial color=#0000ff size=2>We 
have done some more testing and have found out the 
following:</FONT></SPAN></DIV>
<DIV><SPAN class=156290713-11022004><FONT face=Arial color=#0000ff size=2>It 
seems like the problem occurs when the client's window gets full. As RealOne is 
not removing any packets from the window it is slowly filled and eventually the 
TCP ACK messages returned from the client tells that its window-size is 0. This 
causes Apache to start sending HTTP-packets of size 1, which the client TCP 
ACK's with window-size set to 0, etc. This is a reasonable behaviour, but why 
does Apache stop handling other clients while this is ongoing? 
</FONT></SPAN></DIV>
<DIV><SPAN class=156290713-11022004><FONT face=Arial color=#0000ff size=2>We 
have tried installing Apache on a couple of Windows 2003 server machines and 
here there is no problem - it only occurs on the XP's.</FONT></SPAN></DIV>
<DIV><SPAN class=156290713-11022004><FONT face=Arial color=#0000ff size=2>After 
the 'Timeout' (set in httpd.conf) period expires the server (of course) again 
start working probably as the client is dropped.</FONT></SPAN></DIV>
<DIV><SPAN class=156290713-11022004><FONT face=Arial color=#0000ff size=2>We are 
only using two different client machines at a time (but have tried several), so 
it should not be anything regarding some connection limitation on Win XP (I 
think).</FONT></SPAN></DIV>
<DIV><SPAN class=156290713-11022004><FONT face=Arial color=#0000ff size=2>Is it 
a bug or am I doing something wrong?</FONT></SPAN></DIV>
<DIV><SPAN class=156290713-11022004><FONT face=Arial color=#0000ff size=2>Best 
regards</FONT></SPAN></DIV>
<DIV><SPAN class=156290713-11022004><FONT face=Arial color=#0000ff size=2>Peter 
Vestergaard</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr 
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
  <DIV></DIV>
  <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT 
  face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> Peter Posselt 
  Vestergaard [mailto:PPV@MILESTONE.DK] <BR><B>Sent:</B> 10. februar 2004 
  15:14<BR><B>To:</B> users@httpd.apache.org<BR><B>Subject:</B> [users@httpd] 
  apache http-server hangs on .smil,.rm,.swf request<BR><BR></FONT></DIV>
  <P><FONT size=2>Hi list</FONT> <BR><FONT size=2>I am experiencing a weird 
  problem that I have been unable to find any information about, so now I turn 
  to you.</FONT> <BR><FONT size=2>I have a freshly installed Apache HTTP-server 
  v2.0.48 (win32-binary downloaded from <A 
  href="http://httpd.apache.org/download.cgi" 
  target=_blank>http://httpd.apache.org/download.cgi</A>) running on a Windows 
  XP (single-processor). I have made no other configuration than what is done 
  during the install (Typical).</FONT></P>
  <P><FONT size=2>I have copied three files to the htdocs directory: one .smil, 
  one .rm and one .swf file. The .smil file references the two other file - I 
  have put the content of it in the bottom of this message.</FONT></P>
  <P><FONT size=2>On the client machines I am using RealOne Player v2.0 to 
  access the .smil file and it works fine. Untill I tried it on a machine with 
  no sound card. This made the Real Player pop up a dialog telling me a general 
  error had occured. This error was due to the missing sound card and sound in 
  the .rm file, but that is probably irrelevant.</FONT></P>
  <P><FONT size=2>The problem is that while the RealOne dialog is showing I 
  cannot access any pages on the Apache server from any machine! Not even the 
  main test page (telling that apache is installed), but as soon as I press OK 
  in the dialog the pages are served.</FONT></P>
  <P><FONT size=2>I have tried installing Apache on two different WinXP machines 
  - the one with almost nothing else installed - with the same 
result.</FONT></P>
  <P><FONT size=2>Anyone have a clue of what I do/ what is wrong? It is pretty 
  scary to me that one client can hang up the server like this...</FONT></P>
  <P><FONT size=2>Thanks in advance!</FONT> <BR><FONT size=2>Best regards</FONT> 
  <BR><FONT size=2>Peter Vestergaard</FONT> </P>
  <P><FONT size=2>&lt;smil xmlns="<A 
  href="http://www.w3.org/2001/SMIL20/Language" 
  target=_blank>http://www.w3.org/2001/SMIL20/Language</A>"</FONT> <BR><FONT 
  size=2>&nbsp;&nbsp;&nbsp; xmlns:rn="<A 
  href="http://features.real.com/2001/SMIL20/Extensions" 
  target=_blank>http://features.real.com/2001/SMIL20/Extensions</A>"&gt;</FONT> 
  <BR><FONT size=2>&nbsp;&nbsp;&nbsp; &lt;head&gt;</FONT> <BR><FONT 
  size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;meta 
  name="title"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; content="Testing" 
  /&gt;&nbsp;&nbsp; </FONT><BR><FONT 
  size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;layout&gt;</FONT> 
  <BR><FONT 
  size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
  &lt;root-layout backgroundColor="#E8EDF1" width="781" height="450" 
  rn:resizeBehavior="percentOnly"&nbsp; /&gt;</FONT> <BR><FONT 
  size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
  &lt;region id="video" width="539" height="409" left="123" top="2" fit="fill" 
  z-index='31' /&gt;</FONT> <BR><FONT 
  size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
  &lt;region id="logo" width="90" height="78" left="10" top="1" z-index='70' 
  /&gt;</FONT> <BR><FONT size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
  &lt;/layout&gt;</FONT> <BR><FONT size=2>&nbsp;&nbsp;&nbsp; 
  &lt;/head&gt;</FONT> <BR><FONT size=2>&nbsp;&nbsp;&nbsp; &lt;body&gt;</FONT> 
  <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT size=2>&nbsp; 
  &lt;par&gt;</FONT> <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT 
  size=2>&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;animation src="mylogo.swf" 
  region="logo" regPoint="center" regAlign="center" begin="00:00.0" 
  fill="freeze" /&gt;</FONT></P>
  <P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT size=2>&lt;video 
  src="intro.rm" region="video" regPoint="middle" 
  begin="00:00.0"&gt;&lt;/video&gt;</FONT> 
  <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT size=2>&nbsp; 
  &lt;/par&gt;</FONT> <BR><FONT size=2>&nbsp;&nbsp;&nbsp; &lt;/body&gt;</FONT> 
  <BR><FONT size=2>&lt;/smil&gt;</FONT> </P></BLOCKQUOTE></BODY></HTML>

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