Alamofire: Request error: NSURLErrorDomain Code -1005 "The network connection was lost."

I’m working on transferring my project from AFNetworking to Alamofire. Really like the project. However, I’m receiving this error when attempting to make a GET request that worked fine with AFNetworking.

Here’s some example code:

class func listCloudCredntials(includePending includePending: Bool = true, completionBlock:((data: [[String: AnyObject]]?, error: NSError?) -> Void)?) {

    let parameters: [String: AnyObject] = includePending ? ["include_pending": "true"] : [:]

    let urlString = https://myapp-staging.herokuapp.com/api/1/credntials

    let token = SSKeychain.passwordForService(keyJWT, account: user.objectId)

    let headers: [String: String] = ["Authorization": "Bearer \(token)"]

    let request = Alamofire.request(.GET, urlString, parameters: parameters, encoding: .JSON, headers: headers)

    request.responseJSON() {
        (response: Response<AnyObject, NSError>) in

        switch response.result {
        case .Success(let result):
            completionBlock?(data: (result as? [String: AnyObject])?["data"] as? [[String: AnyObject]], error: nil)

        case .Failure(let error):
            completionBlock?(data: nil, error: error)
        }
    }
}

Error Domain=NSURLErrorDomain Code=-1005 "The network connection was lost." UserInfo={NSUnderlyingError=0x14e9c77f0 {Error Domain=kCFErrorDomainCFNetwork Code=-1005 "(null)" UserInfo={_kCFStreamErrorCodeKey=-4, _kCFStreamErrorDomainKey=4}}, NSErrorFailingURLStringKey=https://myapp-staging.herokuapp.com/api/1/credntials, NSErrorFailingURLKey=https://myapp-staging.herokuapp.com/api/1/credntials, _kCFStreamErrorDomainKey=4, _kCFStreamErrorCodeKey=-4, NSLocalizedDescription=The network connection was lost.}

I’ve tried running on the iOS Simulator with 1OS 8.4 and iOS 9.1, as well as my iPhone 6S running iOS 9.1.

What am I doing wrong?