Now, fixed the firewall issue and I still have the same problem. Still
can't verify my subscriptions.

My POST request looks something like this:

header: application/x-www-form-urlencoded
body: hub.callback=http://<machine-name>.doc.res.ic.ac.uk:8082/
push&hub.mode=subscribe&hub.topic=http://pubsubhubbub-example-
app.appspot.com/feed&hub.verify=sync

I keep getting 409 Conflict.

The same thing happens even if I use the website 
https://pubsubhubbub.appspot.com/subscribe
and enter the parameters for the POST request I am using
Callback: (the subscriber URL) http://<machine-name>.doc.res.ic.ac.uk:8082/push
Topic: (the feed URL) http://pubsubhubbub-example-app.appspot.com/feed
Verify type: Synchronous
Mode: Subscribe

I get "Error trying to confirm subscription"

My subscriber is simply not receiving any GET request from the hub. If
I put the callback URL into a browser & hit enter, I receive a GET
request at the subscriber, so it's definitely listening for requests.

Is there something wrong with the parameters of the POST request?

On Jun 13, 4:47 pm, Lucie <[email protected]> wrote:
> I think I figured it out now, it was a firewall issue. My webserver
> was not visible to the outside world because my college only allows me
> to use ports 5500 - 5600. The appspot hub only allows ports '80',
> '443', '4443', '8080', '8081', '8082', '8083', '8084', '8085', '8086',
> '8087', '8088', '8089', '8188', '8444', '8990' -- all of which are
> blocked by my college firewall so that's why I wasn't getting anything
> back from the hub when I tried to use 8080.
>
> Lucie J.
>
> On Jun 13, 10:22 am, Lucie <[email protected]> wrote:
>
>
>
>
>
>
>
> > The sync error -- 409 just says "Conflict"
>
> > On Jun 13, 3:04 am, Julien Genestoux <[email protected]>
> > wrote:
>
> > > Lucie,
>
> > > I'm not so sure about the implementation of the Google hub, but :
> > > - you will always get 202 with async.
> > > - the hub should actually return 422 for sync on errors. Have you checked
> > > the body of the response.
>
> > > Also, please post your request here, so we can help you debug.
>
> > > Thanks,
>
> > > On Fri, Jun 10, 2011 at 3:43 PM, Lucie <[email protected]> 
> > > wrote:
> > > > Hi guys,
>
> > > > I'm beginner with Pubsubhubbub so excuse me if this is a dumb
> > > > question.
> > > > I have a subscriber that subscribes to feeds on
> > > >http://pubsubhubbub.appspot.com
>
> > > > When I use the sync mode I always get 409, when I use async I get
> > > > 202 ... so I figured the subscription request is received by the hub
> > > > but then I am never getting the verification request back from the
> > > > hub?
>
> > > > I've checked onhttp://pubsubhubbub.appspot.com/subscribeanditfinds
> > > > my subscription but says
> > > > state:  not_verified
> > > > Confirmation failures:  4
>
> > > > Any ideas? As far as I can see my callback server is running fine
> > > > (i.e. when I open the callback url in my browser, I can see that a GET
> > > > request is received by the server ...)

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