Welcome to the uipath community.
No need to use any VPN to access this site. I am able to login successfully without any issues. Could you please try once and it still you are getting same error then try in some other browser.
Sometimes the website is down , pls clear your cache and try again
If I don’t have VPN or proxy, can I solve that problem?
it still have problem
Try once in IE browser and check it.
You can contact Uipath support team and they will help you to resolve this issue.