Error Domain NSURLErrorDomain Code -1005 The network connection was lost

Question

I have an application which works fine on Xcode6-Beta1 and Xcode6-Beta2 with both iOS7 and iOS8  But with Xcode6-Beta3  Beta4  Beta5 I m facing network issues with iOS8 but everything works fine on iOS7  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      I use AFNetworking 2 x and the following code snippet to make the network call   AFHTTPRequestOperationManager  manager    AFHTTPRequestOperationManager manager    manager setSecurityPolicy policy   manager requestSerializer    AFHTTPRequestSerializer serializer   manager responseSerializer    AFHTTPResponseSerializer serializer     manager POST  lt example-url gt     parameters  lt parameteres gt        success   AFHTTPRequestOperation  operation  id responseObject              NSLog     Success       responseObject           failure   AFHTTPRequestOperation  operation  NSError  error              NSLog   Error       error               I tried NSURLSession but still receive the same error

User · Answer

The iOS 8 0 simulator runtime has a bug whereby if your network configuration changes while the simulated device is booted  higher level APIs  eg  CFNetwork  in the simulated runtime will think that it has lost network connectivity   Currently  the advised workaround is to simply reboot the simulated device when your network configuration changes   If you are impacted by this issue  please file additional duplicate radars at http   bugreport apple com to get it increased priority   If you see this issue without having changed network configurations  then that is not a known bug  and you should definitely file a radar  indicating that the issue is not the known network-configuration-changed bug

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I faced the same issue while calling using my company s server from iOS 12 app with a physical device  The problem was that the server hard disk was full  Freeing space in the server solved the problem   I found the same error in another situation I think due to a timeout not parametrizable through the standard Networking API provided by Apple  URLSession timeoutIntervalForRequest and URLSession timeoutIntervalForResource   Even there   made server answer faster solved the problem

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If anyone is getting this error while uploading files to a backend server  make sure the receiving server has a maximum content size that is allowable for your media   In my case  NGINX required a higher client max body size   NGINX would reject the request before the uploading was done so no error code came back

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I have this issue also  running on an iOS 8 device  It is detailed some more here and seems to be a case of iOS trying to use connections that have already timed out  My issue isn t the same as the Keep-Alive problem explained in that link  however it seems to be the same end result   I have corrected my problem by running a recursive block whenever I receive an error -1005 and this makes the connection eventually get through even though sometimes the recursion can loop for 100  times before the connection works  however it only adds a mere second onto run times and I bet that is just the time it takes the debugger to print the NSLog s for me   Here s how I run a recursive block with AFNetworking  Add this code to your connection class file     From Mike Ash s recursive block fixed-point-combinator strategy https   gist github com 1254684 dispatch block t recursiveBlockVehicle void   block  dispatch block t recurse            assuming ARC  so no explicit copy     return    block recursiveBlockVehicle block         typedef void   OneParameterBlock  id parameter   OneParameterBlock recursiveOneParameterBlockVehicle void   block  OneParameterBlock recurse  id parameter         return   id parameter   block recursiveOneParameterBlockVehicle block   parameter          Then use it likes this      void runOperationWithURLPath  NSString   urlPath             andStringDataToSend  NSString   stringData                     withTimeOut  NSString   timeOut      completionBlockWithSuccess  void     AFHTTPRequestOperation  operation  id responseObject  success                         failure  void     AFHTTPRequestOperation  operation  NSError  error  failure       OneParameterBlock run   recursiveOneParameterBlockVehicle   OneParameterBlock recurse  id parameter               Put the request operation here that you want to keep trying         NSNumber  offset   parameter          NSLog   --------------- Attempt number     ---------------   offset            MyAFHTTPRequestOperation  operation                 MyAFHTTPRequestOperation alloc  initWithURLPath urlPath             andStringDataToSend stringData             withTimeOut timeOut             operation setCompletionBlockWithSuccess                AFHTTPRequestOperation  operation  id responseObject                    success operation  responseObject                             failure   AFHTTPRequestOperation  operation2  NSError  error                    if  error code    -1005                        if  offset intValue  gt   numberOfRetryAttempts                               Tried too many times  so fail                         NSLog   Error during connection      error description                           failure operation2  error                         else                              Failed because of an iOS bug using timed out connections  so try again                         recurse   offset intValue 1                                            else                       NSLog   Error during connection      error description                       failure operation2  error                                               NSOperationQueue mainQueue  addOperation operation               run  0       You ll see that I use a AFHTTPRequestOperation subclass but add your own request code  The important part is calling recurse  offset intValue 1    to make the block be called again

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I was connecting via a VPN  Disabling the VPN solved the problem

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This might be a problem of the parameter that you are passing to request body  I was also facing the same issue  But then I came across CMash s answer here https   stackoverflow com a 34181221 5867445 and I changed my parameter and it works   Issue in a parameter that I was passing is about String Encoding   Hope this helps

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I had to exit XCode  delete DerivedData folder contents    Library Developer Xcode DerivedData or  Library Developer Xcode DerivedData  and exit simulator to make this work

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Test if you can request from other apps  like safari   If not might be something on your computer  In my case I had this problem with Avast Antivirus  which was blocking my simulators request  don t ask me why

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I was receiving this error and also notices that the application Postman was also falling but was working in app Advanced Rest Client  ARC  and working in Android  So i had to install Charles to debug the communication and I notices that response code was -1  The problem was that REST programmer forgot to return response code 200   I hope that this help other developers

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I had same problem  Solution was simple  I ve set HTTPBody  but haven t set HTTPMethod to POST  After fixing this  everything was fine

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I was facing the same issue  I have enabled Network Link Conditioner for slow network testing for the app  That was creating this error some times  When i have disabled it from Settings  gt  Developer  gt  Network Link Conditioner  it solved my problem     Hope this help someone

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Also have a problem with beta 5 and AFNetworking 1 3 when running on iOS 8 simulator that results in a connection error      Domain NSURLErrorDomain Code -1005  The network connection was lost     The same code works fine on iOS 7 and 7 1 simulators and my debugging proxy shows that the failure occurs before a connection is actually attempted  i e  no requests logged    I have tracked the failure to NSURLConnection and reported bug to Apple  See line 5 in attached image       Changing to use https allows connection from iOS 8 simulators albeit with intermittent errors   Problem is still present in Xcode 6 01  gm

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If the problem is occurring on a device  check if traffic is going through a proxy  Settings   Wi-Fi    info    HTTP Proxy   I had my device setup to use with Charles  but forgot about the proxy  Seems that without Charles actually running this error occurs

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Whenever got error -1005 then need to call API Again   AFHTTPRequestOperationManager  manager     AFHTTPRequestOperationManager manager    manager setSecurityPolicy policy   manager requestSerializer    AFHTTPRequestSerializer serializer   manager responseSerializer    AFHTTPResponseSerializer serializer     manager POST  lt example-url gt     parameters  lt parameteres gt      success   AFHTTPRequestOperation  operation  id responseObject          NSLog     Success       responseObject       failure   AFHTTPRequestOperation  operation  NSError  error          NSLog   Error       error         if  error code    -1005                 Call method again                      You need to Add your code to  call function again  MakeSure that you were call method once otherwise its call recursive loop

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I was experiencing this problem while using Alamofire   My mistake was that I was sending an empty dictionary     for the parameters on a GET request  rather than sending nil parameters   Hope this helps

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In my case it was because i was connecting to HTTP and it was running on HTTPS

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I was hitting this error when passing an NSURLRequest to an NSURLSession without setting the request s HTTPMethod   NSMutableURLRequest  request    NSMutableURLRequest requestWithURL urlComponents URL        Error Domain NSURLErrorDomain Code -1005  The network connection was lost     Add the HTTPMethod  though  and the connection works fine  NSMutableURLRequest  request    NSMutableURLRequest requestWithURL urlComponents URL    request setHTTPMethod   PUT

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We had this exact error and it turned out to be an issue with the underlying HTTP implementation of NSURLRequest   As far as we can tell  when iOS 8 9 10 11 receive an HTTP response with a Keep-Alive header  it keeps this connection to re-use later  as it should   but it keeps it for more than the timeout parameter of the Keep-Alive header  it seems to always keep the connection alive for 30 seconds   Then when a second request is sent by the app less than 30 seconds later  it tries to re-use a connection that might have been dropped by the server  if more than the real Keep-Alive has elapsed    Here are the solutions we have found so far    Increase the timeout parameter of the server above 30 seconds  It looks like iOS is always behaving as if the server will keep the connection open for 30 seconds regardless of the value provided in the Keep-Alive header   This can be done for Apache by setting the KeepAliveTimeout option  You can simply disable the keep alive mechanism for iOS clients based on the User-Agent of your app  e g  for Apache  BrowserMatch  iOS 8    nokeepalive in the mod file setenvif conf  If you don t have access to the server  you can try sending your requests with a Connection  close header  this will tell the server to drop the connection immediately and to respond without any keep alive headers  BUT at the moment  NSURLSession seems to override the Connection header when the requests are sent  we didn t test this solution extensively as we can tweak the Apache configuration

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I was getting the error on an iOS 7 device when I was using Xcode 6 2 beta   Switching back from Xcode 6 2 beta to 6 1 1 fixed the issue  at least on an iOS 7 device

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Got the issue for months  and finally discovered that when we disable DNSSEC on our api domain  everything was ok  simple smile

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Restarting the computer fixed the issue for me with Xcode9 1  I had restarted the simulator and Xcode  it doesn t work

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what solved the problem for me was to restart simulator  and reset content and settings

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Restarting the simulator fixed the issue for me

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I was having this issue for the following reason    TLDR  Check if you are sending a GET request that should be sending the parameters on the url instead of on the NSURLRequest s HTTBody property                                                       I had mounted a network abstraction on my app  and it was working pretty well for all my requests   I added a new request to another web service  not my own  and it started throwing me this error    I went to a playground and started from the ground up building a barebones request  and it worked  So I started moving closer to my abstraction until I found the cause   My abstraction implementation had a bug   I was sending a request that was supposed to send parameters encoded in the url and I was also filling the NSURLRequest s HTTBody property with the query parameters as well  As soon as I removed the HTTPBody it worked

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Opening Charles resolved the issue for me  which seems very strange        Charles is an HTTP proxy   HTTP monitor   Reverse Proxy that enables a developer to view all of the HTTP and SSL   HTTPS traffic between their machine and the Internet  This includes requests  responses and the HTTP headers  which contain the cookies and caching information

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On top of all the answers i found one nice solution  Actually The issue related to network connection fail for iOS 12 onword is because there is a bug in the iOS 12 0 onword  And it Yet to resolved  I had gone through the git hub community for AFNetworking related issue when app came from background and tries to do network call and fails on connection establish  I spend 3 days on this and tries many things to get to the root cause for this and found nothing  Finally i got some light in the dark when i red this blog https   github com AFNetworking AFNetworking issues 4279  It is saying that there is a bug in the iOS 12  Basically you cannot expect a network call to ever complete if the app os not in foreground  And due to this bug the network calls get dropped and we get network fails in logs   My best suggestion to you is provide some delay when your app are coming from background to foreground and there is network call  Make that network call in the dispatch async with some delay  You ll never get network call drop or connection loss    Do not wait for Apple to let this issue solve for iOS 12 as its still yet to fix   You may go with this workaround by providing some delay for your network request being its NSURLConnection  NSURLSession or AFNetworking or ALAMOFIRE  Cheers

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My problem was on the server  I was using Python s BaseHTTPRequestHandler class and I wasn t sending a body in the response  My problem was solved when I put an empty body like the following  def do POST self       content len   int self headers get  Content-Length        post body   self rfile read content len      msg string   post body decode  quot utf-8 quot       msg json   json loads msg string      self send response 200      self end headers    this and the following lines were missing     self wfile write b

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I was getting this error as well  but on actual devices rather than the simulator  We noticed the error when accessing our heroku backend on HTTPS  gunicorn server   and doing POSTS with large bodys  anything over 64Kb   We use HTTP Basic Auth for authentication  and noticed the error was resolved by NOT using the didReceiveChallenge  delegate method on NSURLSession  but rather baking in the Authentication into the original request header via adding Authentiation  Basic  lt Base64Encoded UserName Password gt   This prevents the necessary 401 to trigger the didReceiveChallenge  delegate message  and the subsequent network connection lost

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On 2017-01-25 Apple released a technical Q amp A regarding this error   Apple Technical Q amp A QA1941 Handling    The network connection was lost    Errors A  NSURLErrorNetworkConnectionLost is error -1005 in the NSURLErrorDomain error domain  and is displayed to users as    The network connection was lost     This error means that the underlying TCP connection that   s carrying the HTTP request disconnected while the HTTP request was in progress  see below for more information about this   In some circumstances NSURLSession may retry such requests automatically  specifically  if the request is idempotent  but in other circumstances that   s not allowed by the HTTP standards  https   developer apple com library archive qa qa1941  index html   apple ref doc uid DTS40017602

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For mine  Resetting content and settings of Simulator works  To reset the simulator follow the steps      iOS Simulator -  Reset Content and Settings -  Press Reset  on the   warning which will come

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I had the same problem  I don t know how AFNetworking implements https request  but the reason for me is the NSURLSession s cache problem    After my application tracking back from safari and then post a http request   http load failed 1005  error will appear  If I stop using   NSURLSession sharedSession    but to use a configurable NSURLSession instance to call  dataTaskWithRequest   method as follow  the problem is solved   NSURLSessionConfiguration  config    NSURLSessionConfiguration defaultSessionConfiguration   config requestCachePolicy   NSURLRequestReloadIgnoringLocalCacheData  config URLCache   nil  self session    NSURLSession sessionWithConfiguration config     Just remember to set config URLCache   nil

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See pjebs comment on Jan 5 on Github    Method1    if  error code    -1005        dispatch async dispatch get global queue DISPATCH QUEUE PRIORITY HIGH  0               dispatch group t downloadGroup   dispatch group create            dispatch group enter downloadGroup           dispatch group wait downloadGroup  dispatch time DISPATCH TIME NOW  5000000000       Wait 5 seconds before trying again          dispatch group leave downloadGroup           dispatch async dispatch get main queue                     Main Queue stuff here              self redoRequest     Redo the function that made the Request                           return      Also some suggests to re-connect to the site    i e  Firing the POST request TWICE  Solution  Use a method to do connection to the site  return  id   if the network connection was lost  return to use the same method   Method 2  - id  connectionSitePost  NSString    postSender Url  NSString    URL           here set NSMutableURLRequest   gt   Request      NSHTTPURLResponse  UrlResponse   nil      NSData  ResponseData     NSData alloc  init        ResponseData    NSURLConnection sendSynchronousRequest Request returningResponse  amp UrlResponse error  amp ErrorReturn         if   UrlResponse statusCode     200               if   UrlResponse statusCode     0                             here re-use method                         return  self connectionSitePost  postSender Url  URL                       else             return ResponseData

[ios8] Error Domain=NSURLErrorDomain Code=-1005 "The network connection was lost."

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