Answer

Tableau Server For Windows 2018.2 and later

Reset Server Admin account and password

1. tsm reset - For more information, see tsm reset 
2. tabcmd initialuser - For more information, see initialuser 

Tableau Server for Linux

Reset Server Admin account and password

1. tsm reset - For more information, see tsm reset 
2. tabcmd initialuser - for more information, see initialuser

Tableau Server for Windows 2018.1.x and earlier (pre-tsm)

Reset the Administrator Password

1. On the computer running Tableau Server, open the Command Prompt as an administrator, and navigate to the "bin" folder.

2. At the command prompt, run the following command: tabadmin passwd <username> where <username> is the account for which you want to reset the password.
   This command prompts you to provide the password twice to validate it, after which you will be able to sign in to Tableau Server as that user.

Reset the Administrator Account

1. On the computer running Tableau Server, open the Command Prompt as an administrator, and navigate to the "bin" folder.
2. At the command prompt, run the following command: tabadmin reset
3. Open a browser window, and type localhost in the address bar to set up the administrator account for Tableau Server.

Additional Information

• If using Active Directory or LDAP for the Tableau identity store, then the account and password you specify must match an account in the directory.
• The username is case sensitive.
• For 2018.1.x and earlier: The tabadmin reset command will reset Tableau Server and require you to set up a new administrator account.
• For 2018.2 and later: See the TSM reset commands list for Windows Server
• For Linux versions on Tableau Server please see the TSM reset commands list for Linux Server