You need to change account passwords in Symantec Security Information Manager (SSIM) but you do not have access to the Web UI or the SSIM Console.
Make sure you change the symcmgmt accounts password in the SSIM Client before you run the set-password.sh script.
The recommended action is to change the password for all accounts, as this makes every account have the same password; no need to remember a bunch of passwords.
For information what characters can be used for a password in SSIM, please read the article: What is the length and characters allowed for passwords by Symantec Security Information Manager (SSIM)
Note: This script does not exist on any version older than 4.7.4.
Please see the following document if you receive an error "ChangePassword.jar not found" when running the script.