System.Net.Webclient and more than 2 connections threaded

  • Thread starter Thread starter Fredrik Arenhag
  • Start date Start date
F

Fredrik Arenhag

Hi!

I'm in the process of developing an application for downloading files
from a webserver. This is done in a threaded manner, but how hard I ever
try I can't seem to manage to get more than 2 threads to download at the
same time.

If I launch more than two threads they all start, but only the first two
actually download something. When the first thread completes the third
one happily starts working.

I remember someone somewhere telling me that there was some built in
restriction in win32-platforms that there could not be any more than 2
concurrent http-connections, but I can't seem to find this information
anymore.

Does anyone know if this is the problem and how I might solve it, or if
there is another underlying problem to these symptoms?

TIA!
/Fredrik Arenhag
 
Hi Frederik,

It is working with HTTP1.1 when you search for it you will see that that
allows standard only 2 files to download.

Cor
 
Thank you Cor for your fast response!

So as it looks now this is just something I will have to accept, or is
there some way around this? Registry?

TIA
/Fredrik Arenhag
 
Cor said:
Hi Frederik,

It is working with HTTP1.1 when you search for it you will see that that
allows standard only 2 files to download.
Click to expand...

This has nothing directly to do with the HTTP standard. IE, and many other
clients will only open 2 connections per server per session. By default the
WebClient does the same.

This behavior is controled by the following config setting:

<system.net>
<connectionManagement>
<add address="*" maxconnection="2"/>
</connectionManagement>
</system.net>

Which means that for any web host, a maximum of 2 connections will be opened
per application (AppDomain).

You can change this in machine.config, or override it in your application
config.

David
 
Thanx David!
I'll try this out as soon as I've solved some stupid permission problems
in my ASP.NET application =)

/F
 
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