The administrator may have set your password to expire periodically. You can change your password within the Web Transfer Client.
To change your password
In the upper-right corner, click your login name (in versions prior to 7.4.11, click Account), then click Password. The Change Password dialog box appears.
Provide your Old Password and New Password, and then Confirm Password. If the administrator requires complex passwords, a message will appear if your password does not meet the complex password or reuse password requirements.