log this with plesk if you are using their system as they may be able to help
without a domain people on this forum have decided that we will not spend time troubleshooting as the obvious things usually don't occur to the person communicating and asking for help (hence the requirement for domain names so people can verify DNS setups etc)
an example of such a case How can I verify my domain?
You are free to investigate you own root causes by browsing the forums
Andrei