---
page_type: error
code: 21730
message: "21730: System under maintenance. Please try again later."
level: ERROR
product: Programmable SMS
---

## Description

This error is returned by Twilio Systems when the system is going through a scheduled maintenance. During this maintenance window some of the operations are not allowed and this error is returned.

### Possible Causes

Currently the system is going through some maintenance.

### Possible Solutions

Try again later because once maintenance activity is completed all requests are processed successfully.