Error Domain=NSURLErrorDomain Code=-1003 "A server with the specified hostname could not be found

Question

I get this error when I try running the app on a device. I do not get this error when I run it on the simulator and the post request works fine. This is code snippet I have:

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url    cachePolicy:NSURLCacheStorageNotAllowed timeoutInterval:300.f];
[request setHTTPMethod:@"POST"];

NSData* data = [paramString dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:data];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];

Any help is appreciated. Thanks

Solution 1

With Xcode 11.2.1, working on a macOS project, I had the same issue.

The fix here was:

• Click on project in project explorer
• Select the Signing & Capabilities tab
• Check "Network: Outgoing connections (client)" checkbox in the AppSandbox section

Solution 2

This error would typically suggest a DNS related issue. Check the DNS settings on your device and confirm you can browse the internet using Safari or another browser (double check by visiting a site you have not visited before to ensure it is not cached).

If there is a url you can GET (instead of POST) on the same server, try visiting it directly in Safari on the device.

Solution 3

The simulator uses your computers network connection, so I recommend checking the System Preferences > Network > Advanced > Proxies > Automatic Proxy Configuration : You must disable Automatic conf.

Comments

[Chris Allinson]

Sweet ... I had a similar issue and it turned out that my endpoint was not reachable on my wifi network (i.e. physical device) but was on my hardwired laptop (i.e. iOS Simulator). I had to use a different secure in-house wifi network.

[Mujib Saiyyed]

Thanks man. You are awesome. I had same problem and i was checking safari for internet connectivity. Every time it showed Google page and i felt i had working internet connection. After reading your answer, I checked opening another pages and found that Goggle page was cached one. +1

[ios developer]

i just can't understand that in Android it will work fine with the network but in ios not. what can i exactly do for solve this issue?

[Dania Delbani]

Hey is problem solved for you? I have a similar issue I tried a GET request in Safari and its work fine but within my app I get the same error

[JoCa]

Where do I find this in XCode 11.6 ?

[AmitaiB]

@JoCa It's only for macOS projects, I believe, so you won't see it in iOS projects. Threw me for a minute as well.