Mis alumnos no pueden conectar al mismo tiempo

[Farilop]

Hola, soy profesor.
PC con sistema operativo Educandos (Ubuntu).
Navegador Mozilla

PC con Windows 10
Nvegador Chrome

Cuando los alumnos entran de forma aislada no da el problema.
Cuando los alumnos empiezan a trabajar todos al mismo tiempo la web de app inventor se queda en blanco y caargando. Pasado un tiempo aparece un mensaje de error

There seems to be an issue loading this page:
http://ai2.appinventor.mit.edu/?locale=es_ES
Unable to get response from upstream proxy

A partir de aquí mis alumnos no pueden trabajar más.
1 mes atrás no había problemas,

¿qué pude estas pasando?

saludos

[Anke]

Post a screenshot and also try with Firefox.

[Farilop]

hola
aqui os pongo la pantalla que aparece

[SteveJG]

@Farilop

When students enter in isolation does not give the problem.
When students begin to work all at the same time the web app inventor is blank and caargando.

Your school network probably cannot handle the traffic of multiple simultaneous student connections to App Inventor. Discuss this with your school IT department. Your local network is probably not connecting to your Internet provider when there are too many users.

@Farilop

From here my students may not work more.
1 month ago there were no problems,

what could these happening?

Possibly your school changed internet providers a month ago?