webmethod "push" through NAT (network address translation) firewall-router

[Gene]

Hello,
Instead of having my client (desktop) application poll the server, I would
like to have my server "push" data to a desktop application. The desktop
application will most probably reside on the other side of a firewall/router
with address translation. How do I perform such a feat with HTTP-based web
services?
Thanks in advance,
Gene

[Brock Allen]

Somehow the server would have to know where to now start contacting the client.
The client would have to open up ports. You'd And then they would switch
roles -- the client becomes the server and the server becomes the client.
You have all the standard firewall issues to deal with, but going the other
way now.

-Brock
DevelopMentor
[url]http://staff.develop.com/ballen[/url]

> Hello,
> Instead of having my client (desktop) application poll the server, I
> would
> like to have my server "push" data to a desktop application. The
> desktop
> application will most probably reside on the other side of a
> firewall/router
> with address translation. How do I perform such a feat with HTTP-based
> web
> services?
> Thanks in advance,
> Gene

[Gene]

Right, I was expecting the client application to make the first contact (to
the server). Thereafter I would like the server to push data back to the
client. My issue is how do I navigate the NAT- i.e. everything behind the
router will have individual addresses, but on the "public" side of the
router, everyone will have the same address. -
What techniques do I employ to "drill" through router?
Is it possible to do with HTTP / stateless protocol?
-Gene

"Brock Allen" <ballen@NOSPAMdevelop.com> wrote in message
news:913865632545161837049024@msnews.microsoft.com ...

> Somehow the server would have to know where to now start contacting the
> client. The client would have to open up ports. You'd And then they would
> switch roles -- the client becomes the server and the server becomes the
> client. You have all the standard firewall issues to deal with, but going
> the other way now.
>
> -Brock
> DevelopMentor
> [url]http://staff.develop.com/ballen[/url]
>
>
>

>> Hello,
>> Instead of having my client (desktop) application poll the server, I
>> would
>> like to have my server "push" data to a desktop application. The
>> desktop
>> application will most probably reside on the other side of a
>> firewall/router
>> with address translation. How do I perform such a feat with HTTP-based
>> web
>> services?
>> Thanks in advance,
>> Gene

>
>
>

[Brock Allen]

Ah, so since you're behind NAT you're bumping into restrictions in the infrastructure.
The only thing I can think of is to have the NAT route specifc ports/traffc
to your internal machine. But again, this is probabaly not what you'd like,
especially since this now limits you to that one machine.

-Brock
DevelopMentor
[url]http://staff.develop.com/ballen[/url]

> Right, I was expecting the client application to make the first
> contact (to
> the server). Thereafter I would like the server to push data back to
> the
> client. My issue is how do I navigate the NAT- i.e. everything behind
> the
> router will have individual addresses, but on the "public" side of the
> router, everyone will have the same address. -
> What techniques do I employ to "drill" through router?
> Is it possible to do with HTTP / stateless protocol?
> -Gene
> "Brock Allen" <ballen@NOSPAMdevelop.com> wrote in message
> news:913865632545161837049024@msnews.microsoft.com ...
>

>> Somehow the server would have to know where to now start contacting
>> the client. The client would have to open up ports. You'd And then
>> they would switch roles -- the client becomes the server and the
>> server becomes the client. You have all the standard firewall issues
>> to deal with, but going the other way now.
>>
>> -Brock
>> DevelopMentor
>> [url]http://staff.develop.com/ballen[/url]

>>> Hello,
>>> Instead of having my client (desktop) application poll the server, I
>>> would
>>> like to have my server "push" data to a desktop application. The
>>> desktop
>>> application will most probably reside on the other side of a
>>> firewall/router
>>> with address translation. How do I perform such a feat with
>>> HTTP-based
>>> web
>>> services?
>>> Thanks in advance,
>>> Gene

[Gene]

Right, I'm sure IM clients solve this problem, but I don't want to
introduce a non-http based protocol... is it possible to perform web-service
calls across a "sticky" socket?

"Brock Allen" <ballen@NOSPAMdevelop.com> wrote in message
news:915937632545283651910192@msnews.microsoft.com ...

> Ah, so since you're behind NAT you're bumping into restrictions in the
> infrastructure. The only thing I can think of is to have the NAT route
> specifc ports/traffc to your internal machine. But again, this is
> probabaly not what you'd like, especially since this now limits you to
> that one machine.
>
> -Brock
> DevelopMentor
> [url]http://staff.develop.com/ballen[/url]
>
>
>

>> Right, I was expecting the client application to make the first
>> contact (to
>> the server). Thereafter I would like the server to push data back to
>> the
>> client. My issue is how do I navigate the NAT- i.e. everything behind
>> the
>> router will have individual addresses, but on the "public" side of the
>> router, everyone will have the same address. -
>> What techniques do I employ to "drill" through router?
>> Is it possible to do with HTTP / stateless protocol?
>> -Gene
>> "Brock Allen" <ballen@NOSPAMdevelop.com> wrote in message
>> news:913865632545161837049024@msnews.microsoft.com ...
>>

>>> Somehow the server would have to know where to now start contacting
>>> the client. The client would have to open up ports. You'd And then
>>> they would switch roles -- the client becomes the server and the
>>> server becomes the client. You have all the standard firewall issues
>>> to deal with, but going the other way now.
>>>
>>> -Brock
>>> DevelopMentor
>>> [url]http://staff.develop.com/ballen[/url]
>>>> Hello,
>>>> Instead of having my client (desktop) application poll the server, I
>>>> would
>>>> like to have my server "push" data to a desktop application. The
>>>> desktop
>>>> application will most probably reside on the other side of a
>>>> firewall/router
>>>> with address translation. How do I perform such a feat with
>>>> HTTP-based
>>>> web
>>>> services?
>>>> Thanks in advance,
>>>> Gene

>
>
>

[Brock Allen]

I think the way IM clients make their magic happen is they go to a central
server, so all traffic goes thru a third party (like file txfers). Again,
I think the infrastructure is up against you here... I don't think you're
going to get the callback behavior you want. The closest thing I've seen
is something called "Parking a HTTP request", but I think this is an expensive
approach.

-Brock
DevelopMentor
[url]http://staff.develop.com/ballen[/url]

> Right, I'm sure IM clients solve this problem, but I don't want to
> introduce a non-http based protocol... is it possible to perform
> web-service calls across a "sticky" socket?
>
> "Brock Allen" <ballen@NOSPAMdevelop.com> wrote in message
> news:915937632545283651910192@msnews.microsoft.com ...
>

>> Ah, so since you're behind NAT you're bumping into restrictions in
>> the infrastructure. The only thing I can think of is to have the NAT
>> route specifc ports/traffc to your internal machine. But again, this
>> is probabaly not what you'd like, especially since this now limits
>> you to that one machine.
>>
>> -Brock
>> DevelopMentor
>> [url]http://staff.develop.com/ballen[/url]

>>> Right, I was expecting the client application to make the first
>>> contact (to
>>> the server). Thereafter I would like the server to push data back to
>>> the
>>> client. My issue is how do I navigate the NAT- i.e. everything
>>> behind
>>> the
>>> router will have individual addresses, but on the "public" side of
>>> the
>>> router, everyone will have the same address. -
>>> What techniques do I employ to "drill" through router?
>>> Is it possible to do with HTTP / stateless protocol?
>>> -Gene
>>> "Brock Allen" <ballen@NOSPAMdevelop.com> wrote in message
>>> news:913865632545161837049024@msnews.microsoft.com ...
>>>> Somehow the server would have to know where to now start contacting
>>>> the client. The client would have to open up ports. You'd And then
>>>> they would switch roles -- the client becomes the server and the
>>>> server becomes the client. You have all the standard firewall
>>>> issues to deal with, but going the other way now.
>>>>
>>>> -Brock
>>>> DevelopMentor
>>>> [url]http://staff.develop.com/ballen[/url]
>>>>> Hello,
>>>>> Instead of having my client (desktop) application poll the server,
>>>>> I
>>>>> would
>>>>> like to have my server "push" data to a desktop application. The
>>>>> desktop
>>>>> application will most probably reside on the other side of a
>>>>> firewall/router
>>>>> with address translation. How do I perform such a feat with
>>>>> HTTP-based
>>>>> web
>>>>> services?
>>>>> Thanks in advance,
>>>>> Gene