checkServers()

    func checkServers() {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)) {
            var servers = getServers()
            if (servers.count != 0){
                for index in 0...(servers.count - 1) {
                    //dispatch_async(dispatch_get_main_queue()) {
                        setStatusForAlias(servers[index]["alias"]!, status: "-1")
                        self.drawStatus(NSIndexPath(forRow: ServerIndexForAlias(servers[index]["alias"]!), inSection: 0), status: -1)
                        (self.tableView.cellForRowAtIndexPath(NSIndexPath(forRow: ServerIndexForAlias(servers[index]["alias"]!), inSection: 0))!.viewWithTag(3) as! UIImageView).image = UIImage(named:"finding")
                    //}
                }
                for index in 0...(servers.count - 1) {

                    let alias = servers[index]["alias"]!

                    //NMSSHLogger.sharedLogger().enabled = false

                    let session = NMSSHSession.connectToHost(servers[index]["ip"]!, port: (servers[index]["port"]! != "" && Int(servers[index]["port"]!) != nil) ? Int(servers[index]["port"]!)! : 22, withUsername: servers[index]["ip"])
                    session.timeout = 1

                    dispatch_sync(
                        dispatch_get_main_queue(), {
                            print(session.lastError)})

                    if (session.connected){

                        dispatch_sync(
                            dispatch_get_main_queue(), {

                                if(session.supportedAuthenticationMethods().contains({$0 as! String == "password"})){
                                    var start = true
                                    while (start || session.lastError.code == -9){
                                        print(servers[index]["username"])
                                        start = false
                                        session.authenticateByPassword(servers[index]["password"]!)
                                        print(session.lastError)
                                    }
                                } else {
                                    var start = true
                                    while (start || session.lastError.code == -9){
                                        print(servers[index]["username"])
                                        start = false
                                        //print(session.host)
                                        session.authenticateByKeyboardInteractiveUsingBlock(
                                            {(test: String!) -> String! in
                                                //print("attention: \(test)")
                                                return servers[index]["password"]!
                                            }
                                        )
                                        print(session.lastError)
                                    }
                                }
                            }
                        )

                        if session.authorized == true {
                            dispatch_async(dispatch_get_main_queue()) {
                                setStatusForAlias(alias, status: "0")
                                self.drawStatus(NSIndexPath(forRow: ServerIndexForAlias(alias), inSection: 0), status: 0)
                                (self.tableView.cellForRowAtIndexPath(NSIndexPath(forRow: ServerIndexForAlias(servers[index]["alias"]!), inSection: 0))!.viewWithTag(3) as! UIImageView).image = UIImage(named:"unknown")
                            }
                        } else {
                            dispatch_async(dispatch_get_main_queue()) {
                                setStatusForAlias(alias, status: "1")
                                self.drawStatus(NSIndexPath(forRow: ServerIndexForAlias(alias), inSection: 0), status: 1)
                                (self.tableView.cellForRowAtIndexPath(NSIndexPath(forRow: ServerIndexForAlias(servers[index]["alias"]!), inSection: 0))!.viewWithTag(3) as! UIImageView).image = UIImage(named:"notFound")
                            }
                        }
                    } else {
                        dispatch_async(dispatch_get_main_queue()) {
                            setStatusForAlias(alias, status: "2")
                            self.drawStatus(NSIndexPath(forRow: ServerIndexForAlias(alias), inSection: 0), status: 2)
                            (self.tableView.cellForRowAtIndexPath(NSIndexPath(forRow: ServerIndexForAlias(servers[index]["alias"]!), inSection: 0))!.viewWithTag(3) as! UIImageView).image = UIImage(named:"notFound")
                        }
                    }
                    session.disconnect()
                }
            }
        }
    }