Task login redirect loop but other apps are fine

All 6.3 apps work well, except task which keeps redirecting to the login page: (a) username/password are correct; (b) using nginx into a virtual machine but addresses look fine; © admin belongs to the “Privileges/workflow app”; (d) flowable-ui-task-app and application.properties seem to be fine comparing with the other apps; (e) other applications login/logout without problems.

Is it a token/cookie issue? Many attempts of changing configurations without success.
Any idea how to solve?
thks

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