仅在移动网络上获取错误域= NSURLErrorDomain代码= -1005

Question

I have built an app using Xcode 8.3.2 on iOS 10.3.2. And I have used NSURLSession to implement the webservices. I'm using the following code to do it.

NSMutableURLRequest *request=[[NSMutableURLRequest alloc]initWithURL:Url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:180.0] ;

NSMutableDictionary *dict=[[NSMutableDictionary alloc]init];
[dict setObject:lati forKey:@"latitude"];
[dict setObject:longi forKey:@"longitude"];

NSError *errJsonToData = nil;
NSData *requestPostData=[NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&errJsonToData] ; 

[request setHTTPMethod:@"POST"] ;
[request setValue:[NSString stringWithFormat:@"%lu",(unsigned long)[requestPostData length]] ;forHTTPHeaderField:@"Content-Length"] ;
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:requestPostData] ;


NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session=[NSURLSession sessionWithConfiguration:sessionConfiguration delegate:nil delegateQueue:[NSOperationQueue mainQueue]];

NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable connectionError) {
    if(connectionError)
    {
      NSLog(@"Error Description: %@",[connectionError localizedDescription]);
    } else { //do anything}
}];
[dataTask resume];

Now My webservices urls are http connection. For this I have also added App Transport Security in Info.plist . But the problem is this code works fine when connected to wifi but throws error sometimes while connected to mobile network ie 3G, LTE. I get the error "The network connection was lost." The error is as follows:

Error: Error Domain=NSURLErrorDomain Code=-1005 "The network connection was lost." UserInfo=0x7ba8e5b0 {NSErrorFailingURLStringKey=, _kCFStreamErrorCodeKey=57, NSErrorFailingURLKey=, NSLocalizedDescription=The network connection was lost., _kCFStreamErrorDomainKey=1, NSUnderlyingError=0x7a6957e0 "The network connection was lost."}

If it is a typical server error then why its only happening on mobile network?

Answer 1

Depending on what server you're using, it is possible that the issue is with the "KeepAlive" setting on your server (usually due to higher traffic to the server than expected). Try catching for that specific error code and then re-attempt the exact same URL Request. Hopefully it will just work, but if it has that same error a second time, then there is a bigger issue that needs to be solved.

You can also try looking at the KeepAlive settings on your server and either disable the feature or tweak the settings, but I suggest trying that other option first to narrow down some possible issues.

Good luck!