"Document Contains no Data" -- NCSA. Help?

"Document Contains no Data" -- NCSA. Help?

Post by R Picke » Mon, 08 Jul 1996 04:00:00



I recently updated to NCSA 1.5.1 (on SunOS 4), and am having a scad of
troubles with it.

Most importantly, everyone connecting to our site gets the "Document
Contains no Data" message from Netscape whenever they try to follow a
link.  Press the "reload" button, and poof!  Up pops the correct page.

Any ideas?  What could make the server erroneously report no data in a
document once, and then correctly send the document seconds later?
This is becoming more than a little bit of an annoyance....

Thanks in advance for any help you can give.

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
R Pickett          *      "Change Change Change" -- Adam Duritz      *


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

 
 
 

"Document Contains no Data" -- NCSA. Help?

Post by R Picke » Mon, 08 Jul 1996 04:00:00



>I recently updated to NCSA 1.5.1 (on SunOS 4), and am having a scad of
>troubles with it.

>Most importantly, everyone connecting to our site gets the "Document
>Contains no Data" message from Netscape whenever they try to follow a
>link.  Press the "reload" button, and poof!  Up pops the correct page.

As another point of data for help on this, loading a page with three
or four graphic images will act similarly strangely -- the first time,
two or three of the images show as "broken graphics," then a reload
will bring one or two of them up (sometimes making one that DID appear
the first time show as broken), and then another reload or two will
finally make the whole page appear correctly.

This machine is a Sparc 5, and we're not getting that many hits
simultaneously, so it's not like the server is getting clogged
somehow....  I think....

Please to help....

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
R Pickett          *      "Change Change Change" -- Adam Duritz      *


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

 
 
 

"Document Contains no Data" -- NCSA. Help?

Post by Bob Fillmore 992-28 » Wed, 17 Jul 1996 04:00:00


: I recently updated to NCSA 1.5.1 (on SunOS 4), and am having a scad of
: troubles with it.

: Most importantly, everyone connecting to our site gets the "Document
: Contains no Data" message from Netscape whenever they try to follow a
: link.  Press the "reload" button, and poof!  Up pops the correct page.

: Any ideas?  What could make the server erroneously report no data in a
: document once, and then correctly send the document seconds later?
: This is becoming more than a little bit of an annoyance....

: Thanks in advance for any help you can give.

: ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
: R Pickett          *      "Change Change Change" -- Adam Duritz      *


: ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

We are having the same problems on SunOS 4.1.4 with NCSA HTTPD 1.5.1
and 1.5.2.  Restarting the server seems to fix the problem for a while.

--

  Information Management Branch,
  Natural Resources Canada,                        Voice: (613) 992-2832
  580 Booth St., Ottawa, Ontario, Canada  K1A 0E4  FAX:   (613) 996-2953    

 
 
 

"Document Contains no Data" -- NCSA. Help?

Post by Ken Overto » Wed, 24 Jul 1996 04:00:00




> : Most importantly, everyone connecting to our site gets the "Document
> : Contains no Data" message from Netscape whenever they try to follow a
> : link.  Press the "reload" button, and poof!  Up pops the correct page.

> : Any ideas?  What could make the server erroneously report no data in a
> : document once, and then correctly send the document seconds later?
> : This is becoming more than a little bit of an annoyance....

> : Thanks in advance for any help you can give.

> We are having the same problems on SunOS 4.1.4 with NCSA HTTPD 1.5.1
> and 1.5.2.  Restarting the server seems to fix the problem for a
> while.


I'm having this problem quite a bit now, with NCSA HTTPD 1.5.?a running
on an Indy R4600.  The question mark is because the source code that I
compiled says it's 1.5.1a, but httpd -v says it's version 1.5.0a;  I'm
assuming it's really 1.5.1a.  

Nothing else is running on the server (some mild mail serving) and our
peak hours only do about 7000 hits.  On campus you can simply reload and
you're fine, but our people across the continent seem to be getting
"document contains no data" after reloading more than 3 times.  I've
noticed that we get more of these complaints when there's some heavy
traffic along the way -- I am definitely not saying that they are
therefore related, tho.  I haven't a clue.  There's a million other
things that could be causing it.  Here's some more info for those
interested:

* My server's parsing ALL html docs, because we want includes in
virtually everything.  Our server load is very light, so processing it
shouldn't be a problem, but this might be triggering a bug;
* I took the suggestion of rebooting the server, so my cron reboots my
server every three hours; I haven't seen any noticeable decline in
complaints or problems;
* We've been seeing this for quite a while, but only recently have
people been unable to merely reload the page.  The first day we got
serious complaints I noticed that the main ISP for our campus T1 was
having difficulties with routers going down.  Related?

I would expect that there are more folks out there seeing this, I hope
that we can pool our information to figure it out.

- kov
--

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"Document Contains no Data" -- NCSA. Help?

Post by Ken Overto » Thu, 25 Jul 1996 04:00:00




> : I recently updated to NCSA 1.5.1 (on SunOS 4), and am having a scads
> : of troubles with it.

> : Most importantly, everyone connecting to our site gets the "Document
> : Contains no Data" message from Netscape whenever they try to follow
> : a link.  Press the "reload" button, and poof!  Up pops the correct
> : page.

I sat down with someone else on our site and polled the logfiles each
time she told me she got the error message.  NCSA is not logging those
files, nor is it logging images that occasionally (and apparently
randomly) don't load from the server.  My suspicion is that it's because
of server-parsing.  Almost all my files contain SSIs so I have .html as
a parsed filetype in my srm.conf.  I'll report more when I know more.

- kov

--

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"Document Contains no Data" -- NCSA. Help?

Post by Bob Donahu » Thu, 25 Jul 1996 04:00:00



> > We are having the same problems on SunOS 4.1.4 with NCSA HTTPD 1.5.1
> > and 1.5.2.  Restarting the server seems to fix the problem for a
> > while.

        Same here, although the latency period is decreasing.
I have to restart the server several times a day now, and since
we announced the system as being "up" I'm in the horrible position
of having people's first impressions tainted by a serious bug.

Quote:> * My server's parsing ALL html docs, because we want includes in
> virtually everything.  Our server load is very light, so processing it
> shouldn't be a problem, but this might be triggering a bug;

        ditto here

        I REALLY need a quick-fix solution, even if it means
"jump back to [insert stable version here]".   PLEASE!

Sincerely,
Bob Donahue

 
 
 

"Document Contains no Data" -- NCSA. Help?

Post by Ken Overto » Fri, 26 Jul 1996 04:00:00



> <SNIPPED THREE FOLKS' EMAILS>

> a) this is a known problem is 1.5.1, and should be mostly fixed in 1.5.2,
> but not completely
> b) it is made worse by lots of cgi and ssi

> >       I REALLY need a quick-fix solution, even if it means
> >"jump back to [insert stable version here]".   PLEASE!

> Well, 1.5.0c shouldn't have this bug, so it should be "stable" according
> to that.

> Brandon

Thanks for the indication that NCSA's working on it, Brandon.  That's very much
appreciated.  Unfortunately, I've driven this bug under 1.4, 1.5c, 1.5.1, and 1.5.2.
I've done it with and without XBITHACK.  I've done it with and without SSIs.  I have a
grad student here dedicated to gathering some hard stats on how we can drive it in a way
that is important to us.  I'm most concerned with driving the bug in cases with large
.htaccess files.  While I'm sure SSIs and CGIs are a factor here, I'm choosing to
isolate our trials (1) because it's what's important to us; and (2) because there are
too many variables for me to test them all for you.  I'll be posting our results next
week sometime, if anyone has any tips or requests for what to record in this process
please let me know.

- kov

--

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"Document Contains no Data" -- NCSA. Help?

Post by Brandon Lon » Fri, 26 Jul 1996 04:00:00




>> > We are having the same problems on SunOS 4.1.4 with NCSA HTTPD 1.5.1
>> > and 1.5.2.  Restarting the server seems to fix the problem for a
>> > while.
>    Same here, although the latency period is decreasing.
>I have to restart the server several times a day now, and since
>we announced the system as being "up" I'm in the horrible position
>of having people's first impressions tainted by a serious bug.

a) this is a known problem is 1.5.1, and should be mostly fixed in 1.5.2,
but not completely
b) it is made worse by lots of cgi and ssi

What is happening is that the server is core dumping, hence the document
contains no data, and it is generally happening in free or malloc,
because of the server writing to a free'd block of memory, but we're
having a *y hard time finding it.

Quote:>> * My server's parsing ALL html docs, because we want includes in
>> virtually everything.  Our server load is very light, so processing it
>> shouldn't be a problem, but this might be triggering a bug;
>    ditto here
>    I REALLY need a quick-fix solution, even if it means
>"jump back to [insert stable version here]".   PLEASE!

Well, 1.5.0c shouldn't have this bug, so it should be "stable" according
to that.

Brandon
--
 Brandon Long           "I think, therefore I am Confused." - RAW
 HTTPd/SDG/NCSA/UIUC  "Here's a nickel, kid.  Get yourself a better computer."

 http://www.veryComputer.com/;Consider myself properly disclaimed.    

 
 
 

"Document Contains no Data" -- NCSA. Help?

Post by Brandon Lon » Fri, 26 Jul 1996 04:00:00





>> : I recently updated to NCSA 1.5.1 (on SunOS 4), and am having a scads
>> : of troubles with it.

>> : Most importantly, everyone connecting to our site gets the "Document
>> : Contains no Data" message from Netscape whenever they try to follow
>> : a link.  Press the "reload" button, and poof!  Up pops the correct
>> : page.

>I sat down with someone else on our site and polled the logfiles each
>time she told me she got the error message.  NCSA is not logging those
>files, nor is it logging images that occasionally (and apparently
>randomly) don't load from the server.  My suspicion is that it's because
>of server-parsing.  Almost all my files contain SSIs so I have .html as
>a parsed filetype in my srm.conf.  I'll report more when I know more.

Actually, it will log it, but since the server is core dumping, its
logging it as a core dump, and dieing, so no access is being logged.

Brandon
--
 Brandon Long           "I think, therefore I am Confused." - RAW
 HTTPd/SDG/NCSA/UIUC  "Here's a nickel, kid.  Get yourself a better computer."

 http://www.uiuc.edu/ph/www/blong  Consider myself properly disclaimed.    

 
 
 

1. NCSA httpd 1.5.2 "document contains no data"

I just upgraded to httpd 1.5.2... Now instead of my previous problems
(sometimes a CGI's sourcecode woudl be spewed as text instead of being
executed), I get a different error..

About 20% of the time, when requesting a document (.html, .cgi, or
anything), a popup dialog appears, saying "Document contains no data".
Usually requesting the document a second time works, but occasionally
three tries are necessary to actually get the document.

Any ideas what is causing this?  It could just be a misconfiguration
with the new version.  I hadn't ever seen it before upgrading.

(Please cc replies via email.)

Thanks,

--
Karen Etheridge
CSC Research Co-op, Summer 1996

http://gulf.uvic.ca/~ether

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