Hello Daniel,

Thank you for your response. About when it hangs: it looks like it hangs
randomly, when it hangs processes never finish until they forcefully
terminated (manual termination or server reboot). It always hangs when "I/O
Writes"=50. Apache does not send data to curl running on Windows after it
hangs - there were no Apache processes which were running that long, we also
did not find any log information on Linux suggesting that something wrong
going on there.

Our attempts to reproduce the problem were done from command line on Windows
XP, 2000, 2003 - no problems were found - we actually do not have another
Windows 2003 server were we could have set similar environment (IIS 6, ASP).

Why these processes hang when "I/O Writes"=50 ? Is there some internal
buffer or counter in curl which got overflow or somehow went out of bounds?

Why curl does not recognize that another side of communication has
connection terminated ? We are using max time out parameter in command line
but it looks like it is not used or could not be used due to some reasons.

If you suggest that this is related to network setup then what network
settings may cause such behavior?

Yuri

-----Original Message-----
From: Daniel Stenberg [mailto:daniel-curl_at_haxx.se]
Sent: Saturday, November 13, 2004 5:41 AM
To: curl-users_at_cool.haxx.se
Cc: Yuri
Subject: Re: curl processes hang on windows 2003

On Fri, 12 Nov 2004, Yuri wrote:

> We are running curl from ASP as external command (process) and reading
> stdout. These processes hang quite frequently on Windows 2003 server.
> All processes hang when "I/O Writes"=50 and "I/O Write Bytes"=4031 as
> of Windows task manager (but looks like not byte count is a problem as
> we have some requests returning much more without problems).

My guest hunch is that this is somehow related to your network setup or
possibly on some weirdo thing in Windows 2003 server that curl on "normal"
windows doesn't suffer from.

> Also it looks random the same request may hang or may not hang (I was
> not able to find a way to reproduce it). We are using curl version 7.12.2.

When it hangs, there is still data to receive and it hangs at irregular
positions in the download stream?

How long does it hang? Are you sure that the server actually sends more
data?

> Another side which ASP talks to is Apache webserver on Linux - it
> looks like there are no problems there. What could be the problem ?

Are you saying that when you fetch URLs from a different server it works
every time? Then it most surely sounds like the first server is the flaky
one in this equation, not curl.

-- 
      Daniel Stenberg -- http://curl.haxx.se -- http://daniel.haxx.se
       Dedicated custom curl help for hire: http://haxx.se/curl.html