addressing issue #141

the local relay is not being used and then the connection is refused but it still hangs
in that case is that the sender should give up, prompting the user to try again

src/croc/croc.go

@@ -223,6 +223,8 @@ func (c *Client) Send(options TransferOptions) (err error) {
 	errchan := make(chan error, 1)
 
 	if !c.Options.DisableLocal {
+		// add two things to the error channel
+		errchan = make(chan error, 2)
 		// setup the relay locally
 		for _, port := range c.Options.RelayPorts {
 
@@ -287,6 +289,7 @@ func (c *Client) Send(options TransferOptions) (err error) {
 		if err != nil {
 			err = errors.Wrap(err, fmt.Sprintf("could not connect to %s", c.Options.RelayAddress))
 			log.Debug(err)
+			errchan <- err
 			return
 		}
 		log.Debugf("connection established: %+v", conn)
@@ -320,7 +323,15 @@ func (c *Client) Send(options TransferOptions) (err error) {
 		errchan <- c.transfer(options)
 	}()
 
-	return <-errchan
+	err = <-errchan
+	if err == nil {
+		// return if no error
+		return
+	}
+	if !c.Options.DisableLocal {
+		err = <-errchan
+	}
+	return err
 }
 
 // Receive will receive a file