diff --git a/Prey/Classes/AppDelegate.swift b/Prey/Classes/AppDelegate.swift
index bf577671..254a059f 100644
--- a/Prey/Classes/AppDelegate.swift
+++ b/Prey/Classes/AppDelegate.swift
@@ -88,6 +88,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         if PreyConfig.sharedInstance.isRegistered {
             PreyNotification.sharedInstance.registerForRemoteNotifications()
             TriggerManager.sharedInstance.checkTriggers()
+            RequestCacheManager.sharedInstance.sendRequest()
         } else {
             PreyDeployment.sharedInstance.runPreyDeployment()
         }
diff --git a/Prey/Classes/PreyCoreData.swift b/Prey/Classes/PreyCoreData.swift
index f94fac0b..01600042 100644
--- a/Prey/Classes/PreyCoreData.swift
+++ b/Prey/Classes/PreyCoreData.swift
@@ -103,4 +103,27 @@ class PreyCoreData {
         
         return fetchedObjects
     }
+    
+    // Get current RequestCache
+    func getCurrentRequestCache() -> [RequestCache] {
+        
+        var fetchedObjects  = [RequestCache]()
+        let fetchRequest:NSFetchRequest<NSFetchRequestResult> = NSFetchRequest()
+        
+        guard let entity = NSEntityDescription.entity(forEntityName: "RequestCache", in:managedObjectContext) else {
+            return fetchedObjects
+        }
+        
+        fetchRequest.entity = entity
+        
+        do {
+            if let context = managedObjectContext {
+                fetchedObjects = try context.fetch(fetchRequest) as! [RequestCache]
+            }
+        } catch let error as NSError {
+            PreyLogger("CoreData requestCache error: \(error.localizedDescription)")
+        }
+        
+        return fetchedObjects
+    }
 }
diff --git a/Prey/Classes/PreyHTTPClient.swift b/Prey/Classes/PreyHTTPClient.swift
index 2f98681c..65c1f9cb 100644
--- a/Prey/Classes/PreyHTTPClient.swift
+++ b/Prey/Classes/PreyHTTPClient.swift
@@ -259,6 +259,22 @@ class PreyHTTPClient : NSObject, URLSessionDataDelegate, URLSessionTaskDelegate
             }
         }
         
+        // Save on CoreData requests failed
+        if let err = error, (err as NSError).domain == NSURLErrorDomain, let req = task.originalRequest, let reqUrl = req.url {
+            // check endpoints
+            if reqUrl.absoluteString == (URLControlPanel+locationAwareEndpoint) ||  reqUrl.absoluteString == (URLControlPanel+dataDeviceEndpoint) {
+
+                // Save request
+                RequestCacheManager.sharedInstance.saveRequest(session.configuration, req, err)
+                // Delete value for sessionKey
+                self.requestData.removeValue(forKey:session)
+                self.requestCompletionHandler.removeValue(forKey:session)
+                // Cancel session
+                session.invalidateAndCancel()
+                return
+            }
+        }
+
         DispatchQueue.main.async {
             // Go to completionHandler
             if let onCompletion = self.requestCompletionHandler[session] {
diff --git a/Prey/Classes/RequestCacheManager.swift b/Prey/Classes/RequestCacheManager.swift
index 02fecc32..5d785315 100644
--- a/Prey/Classes/RequestCacheManager.swift
+++ b/Prey/Classes/RequestCacheManager.swift
@@ -17,5 +17,84 @@ class RequestCacheManager:NSObject {
     override fileprivate init() {
     }
     
+    func saveRequest(_ sessionConfig: URLSessionConfiguration, _ request: URLRequest, _ error: Error) {
+        
+        // Init NSManagedObject type RequestCache
+        let requestCache = NSEntityDescription.insertNewObject(forEntityName: "RequestCache", into: PreyCoreData.sharedInstance.managedObjectContext)
+
+        // Check timestamp
+        var req = request
+        var requestTimestamp = CFAbsoluteTimeGetCurrent()
+        if let reqHeader = request.allHTTPHeaderFields, let reqTimestamp = reqHeader["Prey-timestamp"], let timestamp = Double(reqTimestamp) {
+            requestTimestamp = timestamp
+        } else {
+            req.addValue(String(requestTimestamp), forHTTPHeaderField:"Prey-timestamp")
+        }
+                
+        // Set values on NSManageObject
+        let reqData: Data = NSKeyedArchiver.archivedData(withRootObject: req)
+        requestCache.setValue(reqData, forKey: "request")
+        
+        let sessionConfigData: Data = NSKeyedArchiver.archivedData(withRootObject: sessionConfig)
+        requestCache.setValue(sessionConfigData, forKey: "session_config")
+
+        let errorData: Data = NSKeyedArchiver.archivedData(withRootObject: error)
+        requestCache.setValue(errorData, forKey: "error")
+
+        requestCache.setValue(requestTimestamp , forKey: "timestamp")
+        
+        // Pending check requestCompletionHandler.count when > 2 and 1 fail 1 sucess ??
+        if PreyHTTPClient.sharedInstance.requestCompletionHandler.count == 1 {
+            // Save CoreData
+            do {
+                try PreyCoreData.sharedInstance.managedObjectContext.save()
+            } catch {
+                PreyLogger("Couldn't save: \(error)")
+            }
+        }
+    }
     
+    func sendRequest() {
+        let requestCacheArray = PreyCoreData.sharedInstance.getCurrentRequestCache()
+        guard let context = PreyCoreData.sharedInstance.managedObjectContext else {return}
+        
+        // Send requests
+        for req in requestCacheArray {
+            guard let request = req.request, let sessionConfig = req.session_config, let error = req.error, let time = req.timestamp else {
+                context.delete(req)
+                return
+            }
+            
+            guard let decodedRequest = NSKeyedUnarchiver.unarchiveObject(with: request) as? URLRequest, let decodedSession = NSKeyedUnarchiver.unarchiveObject(with: sessionConfig) as? URLSessionConfiguration, let decodedError = NSKeyedUnarchiver.unarchiveObject(with: error) as? Error else {
+                context.delete(req)
+                return
+            }
+            
+            // Check timestamp
+            guard (time.doubleValue + 60*60*24) > CFAbsoluteTimeGetCurrent() else {
+                PreyConfig.sharedInstance.reportError(decodedError)
+                context.delete(req)
+                return
+            }
+            
+            // Resend requests
+            let session = URLSession(configuration:decodedSession, delegate:PreyHTTPClient.sharedInstance, delegateQueue:nil)
+            
+            // Add onCompletion to array
+            let onCompletion = PreyHTTPResponse.checkResponse(RequestType.dataSend, preyAction:nil, onCompletion:{(isSuccess: Bool) in PreyLogger("Request dataSend")})
+            PreyHTTPClient.sharedInstance.requestCompletionHandler.updateValue(onCompletion, forKey: session)
+            
+            // Prepare request
+            PreyHTTPClient.sharedInstance.sendRequest(session, request: decodedRequest)
+            
+            context.delete(req)
+        }
+        
+        // Save CoreData
+        do {
+            try context.save()
+        } catch {
+            PreyLogger("Couldn't save: \(error)")
+        }
+    }
 }