[users@httpd] Page Will Not Display After Modifications

["Laus, Ryan J." <la...@cmich.edu>]

Hello everyone,

I tried posting about this problem before but never received a response
back from anybody.  Have been trying to figure this out for about a
month now.  I Was able to gather some more information so maybe someone
could possibly help.

Currently running Apache 2.0.46 on AIX 4.3.3.  The problem we are having
is whenever someone edits a web page (either directly on the server or
on a local machine and then FTP the page to the server) and tries to
view that page, we get a "Page cannot be displayed" error for about 4
minutes.  After 4 minutes the page will magically be viewable.  

I then did some packet captures to see what was actually happening
between the web server and the client.  After the changes have been made
to the page, the client will try to GET the web page.  The next packet
back from the server is a FIN ACK packet, which starts the TCP teardown
sequence, which is why the "Page cannot be displayed" comes up.  This
goes on for around 4-5 minutes.  Then, all of the sudden, the HTTP GET
packet works and the server acknowledges back with a "HTTP/1.1 200 OK"
and the page can then be viewed.  Any following requests will then get
the "HTTP 1.1 NOT MODIFIED 304", which is fine since the page is now
cached on the local client.  

This also only seems to happen on somewhat larger html files 10k+.  The
file we have used for testing is around 14k which is around the same
size as most of our web page.  We have made just simple html files and
can edit them and view them right away without any problems.  

We have also installed Apache 2.0.46 on another AIX 4.3.3 box and have
had the same problem.

Any suggestions will be greatly appreciated!!!!!!  Thanks!

Ryan Laus




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Re: [users@httpd] Page Will Not Display After Modifications

[Robert Andersson <ro...@profundis.nu>]

Laus, Ryan J wrote:
> I then did some packet captures to see what was actually happening
> between the web server and the client.  After the changes have been made
> to the page, the client will try to GET the web page.  The next packet
> back from the server is a FIN ACK packet, which starts the TCP teardown
> sequence, which is why the "Page cannot be displayed" comes up.

You mean that the connection is simply killed as soon as the request is
made?

[pre-coffee]
My TCP skills are a bit rusty now, but if I remember correctly, FIN ACK is
what one party sends to acknowledge the closing initiated by the other party
which would indicate that it is the client that is closing on the server. It
could, however, be the other way around, as you suggested.
[/pre-coffee]

> This goes on for around 4-5 minutes.  Then, all of the sudden, the HTTP
> GET packet works and the server acknowledges back with a
> "HTTP/1.1 200 OK" and the page can then be viewed.

Is this only the case when requesting the file that has previously been
modified, or does it apply to any file? And there is nothing in the access
or error log about it?

I'd guess that this is an OS issue, and I'd suggest you run a strace, so you
can see where it goes down.

Regards,
Robert Andersson.


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