iOS NSURLConnection object always returns same response
===

I'm creating an iPhone app that consumes a json webservice. I have an NSURLRequest and NSURLConnection object that are used to load JSON data from that webservice:

<pre><code>
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] 
                                    initWithURL:url 
                                    cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                    timeoutInterval:30];
    [request setHTTPMethod: @"POST"];
    //[request setHTTPShouldHandleCookies:YES];
    
    
    //create connection
    NSURLConnection *connection = [[NSURLConnection alloc] 
                                   initWithRequest:request delegate:self];
    [connection start];
</pre></code>

First time I executed the above code, using as the url "admin.mydomain.com/param1/value1/param2/value2", the response came through correctly (a JSON string: {"Wrong API Key"}). 

I then changed the url to my staging server: "admin.stg.mydomain.com/param1/value1/param2/value2". This server provides me with some completely different output (when I try that new url in a browser, the correct output is shown, a json object completely different from what the first url gives me), but in my iphone app I still get the exact same response I got from the other server. If I try non existent urls I do get a correct error message. 

It just seems to have cached the result from the original server and returns the same value for my stg subdomain, somehow matching the two urls (is this possible?), but I have cleared all caching data I could find. I have tried to clean the build and build directory, restarted xcode, the computer and everything, the cache policy is set to ignore the cache (see code). Important: I get the same behavior on my actual iPhone, not just the simulator.

Does anyone have any idea what could cause this kind of behavior? Am I forgetting something obvious?

I have been looking at this for hours on end now, any help is greatly appreciated!