When you visit a website and you get the error 503 network error it usually means something is wrong with the server or website that the website owner needs to fix.
Basically a network 503 error is an HTTP response status code that indicates that a server is temporarily unable to handle the request.
It's usually caused by the server being overloaded with requests or the server could just be temporarily down for maintenance.
When you get a 503 error when visiting a website the best thing to do is just wait 20 to 30 minutes or an hour and the website should come back online.