diff --git a/ftp.go b/ftp.go
index 49968ba..508b3c9 100644
--- a/ftp.go
+++ b/ftp.go
@@ -657,11 +657,14 @@ func (c *ServerConn) StorFrom(path string, r io.Reader, offset uint64) error {
 		return err
 	}
 
-	_, err = io.Copy(conn, r)
+	// if the upload fails we still need to try to read the server
+	// response otherwise if the failure is not due to a connection problem,
+	// for example the server denied the upload for quota limits, we miss
+	// the response and we cannot use the connection to send other commands.
+	// So we don't check io.Copy error and we return the error from
+	// ReadResponse so the user can see the real error
+	io.Copy(conn, r)
 	conn.Close()
-	if err != nil {
-		return err
-	}
 
 	_, _, err = c.conn.ReadResponse(StatusClosingDataConnection)
 	return err
@@ -678,11 +681,9 @@ func (c *ServerConn) Append(path string, r io.Reader) error {
 		return err
 	}
 
-	_, err = io.Copy(conn, r)
+	// see the comment for StorFrom above
+	io.Copy(conn, r)
 	conn.Close()
-	if err != nil {
-		return err
-	}
 
 	_, _, err = c.conn.ReadResponse(StatusClosingDataConnection)
 	return err