If you have just inherited an Untangle appliance that was previously administrated by another, possibly former employee, we recommend the following:
1) Connect to the Untangle appliance and change all administrator account passwords. Possibly removing those accounts if no longer needed. The administrator password can be changed by going to Config --> Administration and clicked the Change Password button next to each account. This process requires knowing an admin password. If the current password is not known try step 2.
2) Login to Command Center. Command Center can be used to remotely administer Untangle appliances, assuming all of the remote access requirements have been met. A password reset can also be sent for Command Center access, however this requires access to the email account.
3) Finally an admin password reset can be attempted by following the guide found here.