# Regenerate SMPP ESME trunk credentials

Regenerate the credentials of an SMPP ESME trunk, for example if they were
exposed or as part of regular credential rotation. DIDWW replaces both the
**System ID** and the **Password**. Then update every application that binds
with the trunk.

Important

The **System ID** and **Password** are replaced immediately when you
regenerate the credentials. There is no confirmation prompt. DIDWW closes
every bind that is open with the old credentials within a few seconds, so
connected applications are disconnected. Update every application right away
so that it can bind again.

## Before you begin

- An active DIDWW account is required. [Sign in to DIDWW](https://my.didww.com/users/sign_in).
- An SMPP ESME trunk is required. If you do not have one, see [Create an
  SMPP ESME trunk](create-smpp-esme-trunk.html).
- Identify every application that binds with the trunk's current credentials,
  so that you can update them right after you regenerate them.

## Step 1: Open the credentials window

1. In the DIDWW User Panel, go to **SMS > SMS Trunks**.
2. Locate the SMPP ESME trunk and click the key icon in its **Credentials**
   column.

[![SMS Trunks page with the key icon in the Credentials column of an SMPP ESME trunk highlighted](../../../../_images/credentials_button.png)](../../../../_images/credentials_button.png)


**Fig. 1.** Open the trunk credentials

## Step 2: Regenerate the credentials

In the credentials window, click the regenerate icon (circular arrows) next to
the **Password** field. The window shows the new **System ID** and
**Password** right away.

[![SMPP ESME trunk credentials window with the regenerate icon next to Password highlighted](../../../../_images/credentials-regenerate.webp)](../../../../_images/credentials-regenerate.webp)


**Fig. 2.** Regenerate the credentials

## Step 3: Update your applications

1. Click the eye icon next to **Password** to show the new password.
2. Copy the new **System ID** and **Password**, and update every application
   that binds with them.
3. Check that each application is connected. See [Check SMPP ESME trunk
   connection status](check-smpp-esme-trunk-connection-status.html).

An application that still uses the old credentials cannot bind. DIDWW
rejects the bind request with the `ESME_RBINDFAIL` (`0x0000000D`) command
status and closes the connection.

## Related resources

- [View SMPP ESME trunk credentials](view-smpp-esme-trunk-credentials.html) -
  Show the Host, Port, System ID, Password, and System Type of the trunk.
- [Bind an SMPP ESME trunk](bind-smpp-esme-trunk.html) - Configure your
  application with the bind parameters.
- [Credentials and connection information](../smpp-esme-trunk-settings-reference.html#smpp-esme-settings-credentials) - Look up each value shown in the
  credentials window.