Partial web page loading

[Scott Stevenson]

I'm a relatively new user of FreeBSD (5.3 release), and have
encountered a problem that I haven't seen on other platforms. The
details and a screenshot are outlined here:

[url]http://theocacao.com/document.page/82[/url]

Essentially, web content (text and images alike, it seems) occasionally
fails to load in entirety. I personally haven't be able to recreate
this yet, but a few people have sent me emails about it. I didn't hear
anything about this prior to switching to FreeBSD. This is the exact
same content I had running on a Red Hat-based machine running the same
version of Apache.

I've done a lot of googling and looking through mailing list archives,
but haven't been able to identify any real leads yet. Syslog doesn't
suggest anything is amiss. My environment is:

FreeBSD 5.3-Release
Apache 2.0.50
PHP 5.0.2
BIND 9.3.0

Both Apache and PHP were built from ports. I realize Apache is a few
versions behind, and I'm going to upgrade it. Looking at the changelog,
though, I can't seem to find anything that would pertain to this.

Any ideas?


Thanks,

- Scott

--
[url]http://treehouseideas.com/[/url]
[url]http://theocacao.com/[/url] [blog]

[Chris]

Scott Stevenson wrote:

> I'm a relatively new user of FreeBSD (5.3 release), and have encountered
> a problem that I haven't seen on other platforms. The details and a
> screenshot are outlined here:
>
> [url]http://theocacao.com/document.page/82[/url]
>
> Essentially, web content (text and images alike, it seems) occasionally
> fails to load in entirety. I personally haven't be able to recreate this
> yet, but a few people have sent me emails about it. I didn't hear
> anything about this prior to switching to FreeBSD. This is the exact
> same content I had running on a Red Hat-based machine running the same
> version of Apache.
>
> I've done a lot of googling and looking through mailing list archives,
> but haven't been able to identify any real leads yet. Syslog doesn't
> suggest anything is amiss. My environment is:
>
> FreeBSD 5.3-Release
> Apache 2.0.50
> PHP 5.0.2
> BIND 9.3.0
>
> Both Apache and PHP were built from ports. I realize Apache is a few
> versions behind, and I'm going to upgrade it. Looking at the changelog,
> though, I can't seem to find anything that would pertain to this.
>
> Any ideas?
>
>
> Thanks,
>
> - Scott
>

See if the issue continues. Is it only certain days? Certain hours? From
certain locales? I would not be surprised if it clears up. If it does,
chalk it up to your ISP


--
Best regards,
Chris

Program complexity grows until it exceeds the capability
of the programmer who must maintain it.

[Kevin Kinsey]

Chris wrote:

> Scott Stevenson wrote:
>

>> I'm a relatively new user of FreeBSD (5.3 release), and have
>> encountered a problem that I haven't seen on other platforms. The
>> details and a screenshot are outlined here:
>>
>> [url]http://theocacao.com/document.page/82[/url]
>>
>> Essentially, web content (text and images alike, it seems)
>> occasionally fails to load in entirety. I personally haven't be
>> able to recreate this yet, but a few people have sent me
>> emails about it. I didn't hear anything about this prior to
>> switching to FreeBSD. This is the exact same content I had
>> running on a Red Hat-based machine running the same version of Apache.
>>
>> I've done a lot of googling and looking through mailing list
>> archives, but haven't been able to identify any real leads yet.
>> Syslog doesn't suggest anything is amiss. My environment is:
>>
>> FreeBSD 5.3-Release
>> Apache 2.0.50
>> PHP 5.0.2
>> BIND 9.3.0
>>
>> Both Apache and PHP were built from ports. I realize
>> Apache is a few versions behind, and I'm going to upgrade it.
>> Looking at the changelog, though, I can't seem to find
>> anything that would pertain to this.
>>
>> Any ideas?

>
>
>
> See if the issue continues. Is it only certain days? Certain hours?
> From certain locales? I would not be surprised if it clears up. If
> it does, chalk it up to your ISP

Are we understanding correctly that it's the server at issue?

Pages from theocacao.com are looking fine here. On cocoadevcentral.com,
the article I looked at seemed fine; however, the right sidebar/navbar
seemed
truncated. I felt sure it was a rendering/CSS bug, though.

I'd sure keep an eye on:

top(1)
/var/log/httpd-access.log
/var/log/httpd-error.log

Is there any pattern to these "misloaded" pages?

Kevin Kinsey

[Scott Stevenson]

On Feb 20, 2005, at 1:39 PM, Kevin Kinsey wrote:

> Are we understanding correctly that it's the server at issue?
>
> Pages from theocacao.com are looking fine here. On
> cocoadevcentral.com,
> the article I looked at seemed fine; however, the right sidebar/navbar
> seemed
> truncated. I felt sure it was a rendering/CSS bug, though.

Interesting. Could you detail what you see, or send me a screenshot
off-list? It's possible you may have encountered the problem. Which
browser are you using? Does it look like this screenshot pictured here?
[url]http://theocacao.com/document.page/82[/url]

> top(1)

It's definitely not a load issue.

> /var/log/httpd-access.log
> /var/log/httpd-error.log

I've looked through these. Nothing unusual.

> Is there any pattern to these "misloaded" pages?

I don't really have enough data to answer that, unfortunately. I
haven't been able to recreate the problem myself, either.

The only thing I can say for sure is that no one emailed about this
prior to the switch to FreeBSD. Not that it's necessarily a
platform-specific issue, but it's all I have to go on right now.


Thanks,

- Scott


--
[url]http://treehouseideas.com/[/url]
[url]http://theocacao.com/[/url] [blog]

[Andrew L. Gould]

> > Scott Stevenson wrote:

> >> I'm a relatively new user of FreeBSD (5.3 release), and have
> >> encountered a problem that I haven't seen on other platforms. The
> >> details and a screenshot are outlined here:
> >>
> >> [url]http://theocacao.com/document.page/82[/url]
> >>
> >> Essentially, web content (text and images alike, it seems)
> >> occasionally fails to load in entirety. I personally haven't be
> >> able to recreate this yet, but a few people have sent me
> >> emails about it. I didn't hear anything about this prior to
> >> switching to FreeBSD. This is the exact same content I had
> >> running on a Red Hat-based machine running the same version of
> >> Apache.
> >>
> >> I've done a lot of googling and looking through mailing list
> >> archives, but haven't been able to identify any real leads yet.
> >> Syslog doesn't suggest anything is amiss. My environment is:
> >>
> >> FreeBSD 5.3-Release
> >> Apache 2.0.50
> >> PHP 5.0.2
> >> BIND 9.3.0
> >>
> >> Both Apache and PHP were built from ports. I realize
> >> Apache is a few versions behind, and I'm going to upgrade it.
> >> Looking at the changelog, though, I can't seem to find
> >> anything that would pertain to this.
> >>
> >> Any ideas?

Are you sure it's not an odd browser configuration issue? For example:

For the longest time, the images at [url]http://bsdmall.com/[/url] wouldn't load in
mozilla but would in konqueror. One day, I stumbled across a
configuration item in mozilla to "Accept images that come from
originating server only". I must have checked it accidentaly. After I
unchecked that item, everything loaded fine.

Best of luck,

Andrew Gould

[Scott Stevenson]

On Feb 20, 2005, at 4:37 PM, Andrew L. Gould wrote:

> Are you sure it's not an odd browser configuration issue? For example:
>
> For the longest time, the images at [url]http://bsdmall.com/[/url] wouldn't load
> in
> mozilla but would in konqueror. One day, I stumbled across a
> configuration item in mozilla to "Accept images that come from
> originating server only". I must have checked it accidentaly. After I
> unchecked that item, everything loaded fine.

I wish it was that easy. :)

Unfortunately, I doubt this is the case because an image will load
partially.

- Scott

--
[url]http://treehouseideas.com/[/url]
[url]http://theocacao.com/[/url] [blog]

[Scott Stevenson]

I wrote:

> Essentially, web content (text and images alike, it seems)
> occasionally fails to load in entirety. I personally haven't be
> able to recreate this yet, but a few people have sent me
> emails about it. I didn't hear anything about this prior to
> switching to FreeBSD. This is the exact same content I had
> running on a Red Hat-based machine running the same version of
> Apache.

I've done a bunch of research and testing on this, and received a
follow-up email from one of the people that originally reported the
problem (attached below, sorry about the length).

I've determined that the files on the server are completely intact and
don't appear to have any stray control characters embedded in them.
I've considered the possibility that this is a PHP bug, but that
doesn't explain the issues with image downloads or the CSS file. It
appears the outgoing data is actually getting munged. The problem even
occurs just using wget. I haven't been able to personally recreate
this, but he can every time.

This sure looks a lot like something's overwriting memory in place
where it shouldn't.


Any ideas? Should I post this to the bug list?

Thanks,

- Scott


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

> Could you try the site again and let me know what you find? I found
> and corrected a minor issue.

Sorry, no improvement..

I looked a bit closer and it seems to be some weird networking related
problem. If I look at:

[url]http://www.cocoadevcentral.com/articles/000081.php[/url]

I see this at the end of the page source:

-------------
here's no filler here. Stay entirely focused on the contents of each
paragraph.
</p>


<p>
<p class="extranote">
special thanks to Kip Krueger a0
-------------

This is the end of:

[url]http://www.cocoadevcentral.com/articles/000082.php[/url]

-------------
<div class="body">
NSPasteboard<br />
NSCell<br />
NSComboBox<br />
NSComboBoxCell<br />

NSMenuItem<br />
NSMenuItemCell<0
-------------

Same with the main page:

-------------
<a href="/articles/000063.php">Table Views</a><br />
<a href="/articles/000037.php">Toolbars</a>0
-------------

If I fetch one of those pages (000082.php) with wget from the command
line I get only this at the end:

-------------
NSMenuItemCell<br />
</div>
</div>

<p>
Cocoa strongly encourages <em>expressive,
-------------


The main page:

-------------
<a href="/articles/000037.php">Toolbars</a><br />
<a href="/articles/000056.php">Drag and
Drop</a><br />
<a
-------------

And the weirdest thing is that I can't access your site at all from my
router (also a Linux box). Hmm. This is really, really weird, it also
doesn't work when I disable shorewall (IP Masquerading, firewall)
completely...

What webserver are you using?

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

[Scott Stevenson]

On Feb 22, 2005, at 9:56 AM, Scott Stevenson wrote:

> I've done a bunch of research and testing on this, and received a
> follow-up email from one of the people that originally reported the
> problem (attached below, sorry about the length).
>
> I've determined that the files on the server are completely intact and
> don't appear to have any stray control characters embedded in them.
> I've considered the possibility that this is a PHP bug, but that
> doesn't explain the issues with image downloads or the CSS file. It
> appears the outgoing data is actually getting munged. The problem even
> occurs just using wget. I haven't been able to personally recreate
> this, but he can every time.
>
> This sure looks a lot like something's overwriting memory in place
> where it shouldn't.
>
>
> Any ideas? Should I post this to the bug list?

Also, here are the relevant lines from pf.conf. I want to avoid sending
the complete file. As mentioned in my last post, the person who sent
the original complaint is unable to reach the site at all from behind
his Linux-based router.


pass in quick on $ext_if proto { tcp, udp } from any to any port 53
pass in quick on $ext_if proto { tcp, udp } from any to any port 80
pass out on $ext_if proto { tcp, udp } all keep state

# pass incoming ports for ftp-proxy
pass in on $ext_if inet proto tcp from any to $ext_if user proxy keep
state


Does this all look reasonable? I did a lot of reading but I'm still
pretty new to pf.


Thanks again,

- Scott

--
[url]http://treehouseideas.com/[/url]
[url]http://theocacao.com/[/url] [blog]

[J65nko BSD]

It could have something to do with an incorrect MTU size. This can
cause partial loading of webpages. See
[url]http://www.cisco.com/warp/public/794/router_mtu.html[/url]

Adriaan

On Sun, 20 Feb 2005 12:46:09 -0800, Scott Stevenson <scott@maxify.com> wrote:

> I'm a relatively new user of FreeBSD (5.3 release), and have
> encountered a problem that I haven't seen on other platforms. The
> details and a screenshot are outlined here:
>
> [url]http://theocacao.com/document.page/82[/url]
>
> Essentially, web content (text and images alike, it seems) occasionally
> fails to load in entirety. I personally haven't be able to recreate
> this yet, but a few people have sent me emails about it. I didn't hear
> anything about this prior to switching to FreeBSD. This is the exact
> same content I had running on a Red Hat-based machine running the same
> version of Apache.
>
> I've done a lot of googling and looking through mailing list archives,
> but haven't been able to identify any real leads yet. Syslog doesn't
> suggest anything is amiss. My environment is:
>
> FreeBSD 5.3-Release
> Apache 2.0.50
> PHP 5.0.2
> BIND 9.3.0
>
> Both Apache and PHP were built from ports. I realize Apache is a few
> versions behind, and I'm going to upgrade it. Looking at the changelog,
> though, I can't seem to find anything that would pertain to this.
>
> Any ideas?
>
> Thanks,
>
> - Scott
>
> --
> [url]http://treehouseideas.com/[/url]
> [url]http://theocacao.com/[/url] [blog]
>
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