If SSH is enabled, you can try to login via putty using the same credentials and check if that works. If not, then try unlocking the account or change the password.
This KB is for vSphere replication, however instructions remain same for SRM(photon appliances) as well --> VMware Knowledge Base
Hope that helps
thank you for your answare.
root user can't lock, it is a new install and after deploy the problem is appears.
I never try to login by root, I used VAMI page to login appliance only.
Restart of the appliance solve the problem, I'm able to login again by VAMI w. admin user, but it is work just a short time.