We recommend creating a secondary user account for sign in to for trading purposes on your VPS, not just using "administrator". If you sign in with the "administrator" username, it is possible that account may be locked due to too many brute force attempts to access the server with incorrect passwords.
To change the default policy that allows the "administrator" account to be locked due to too many failed login attempts, select "Edit Group Policy". Search for "group" from the start menu to locate it:
This policy can be found under Local Computer Policy\Computer Configuration\Windows Settings\Security Settings\Account Policies\Account Lockout Policies. If you set Allow Administrator account lockout to Disabled, you will not get locked out of the administrator account.