"Unable to attach to one of the drives" error is reported while backing up a remote system, and the job log may also display "Error: ffffdfc4 The job failed."

This error (Figure 1) can occur when the username or password (of the remote system) that is associated with the logon account (on the Backup Exec (tm) server) has been changed.

Figure 1
 

For example, assume you are backing up a remote system named client, using a Backup Exec server named server, and there is a user on client named "administrator," with "password" as the password.
A logon account in Backup Exec was created with the account name "administrator" and password of "password." This account was selected to connect to client for backup purposes.
For security reasons, the actual "administrator" password was changed on client. Now, when Backup Exec tries to use the logon account created (as above), it will fail to connect because there is a mismatch between the logon account created in Backup Exec and the account on client.

To resolve this issue, modify the logon account on the Backup Exec server to match with the username and password of the remote system.

1. Open Backup Exec software

2. On the Network menu, click Logon Accounts (Figure 2)

Figure 2
 

3. Highlight the required account that is used to connect to the remote system and click the Edit button (Figure 3)

Figure 3
 

4. Click the Change Password button to change the password (Figure 4)

Figure 4
 

5. Create a new job for the remote system to use this  account

Apart from the above, there are certain other conditions responsible for this error.
For more information, refer to the Related Documents section below.