Question: i create a simple browser that can load a local file using UIWebview. At first,when i try to preview a html file, the uiwebview can load the source file and preview it. But after i minimize the app (the app enter background), and then open the app again, i've got this error :

```
Error Dict: {
    NSNetServicesErrorCode = "-72000";
    NSNetServicesErrorDomain = 10;
}

```

and after that, the uiwebview can not load the source file, when i log the error in `(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error`, it shows this message : 

```
Error Domain=NSURLErrorDomain Code=-1004 "Could not connect to the server." UserInfo=0x53d610 {NSErrorFailingURLStringKey=http://localhost:9898/local/a.html?83C66B33-874C-41A7-BBF5-78D1615512DF, NSErrorFailingURLKey=http://localhost:9898/local/a.html?83C66B33-874C-41A7-BBF5-78D1615512DF, NSLocalizedDescription=Could not connect to the server., NSUnderlyingError=0x5ccaa0 "Could not connect to the server."}

```

the app isn't crash, but the spinning indicator is never stop.

could somebody tell me what cause this case? and how to solved it?

Thank you :)

Answer: 
The problem seems to be the host you are trying to connect to: `http://localhost:9898/local/[..]` 

Localhost on your computer is your computer, localhost on your ipad is your ipad - for testing use resolvable domain name or ip address.
Sergiu Todirascu's comment in the question solved it for me. The Mac Sandbox was causing this, I had to turn on Networking, in my case Incoming and Outgoing network checkboxes, in the entitlements tab. Creating an answer so it is more easy to see.