2015년 1월 6일 화요일

Server connection problem - if 40 students try to connect at the same time....

Hello. I'm an informatics teacher in Korea and now I run some teacher training course with AI2.

There are 38 teachers who want to learn AI and they are all in one classroom.

Today, I told them to connect to AI2 website (http://ai2.appinventor.mit.edu) with Chrome, only half of them succeeded to reach the AI server.

Teachers who could not reach the server tried again and again, but some of them (maybe 6 or 7) could not connect to the server.

And some teachers who connected to server said that their session had expired and they had to reload the page. And some said the server did not answer their command.

Obviously, it is not the problem of network of the classroom. It is built for computer training so it has a broadband network for learning. When they tried to connect other server, it went well.

I think there is a connection issue when many computer access simultaniously.

I want to know what's the problem because I want to use AI in my programming class with students. Generally, there are 20 to 35 students in one class. If there is a connection problem, I have to change the tool, even though I like AI.

Please notice me how to solve this connection problem. 

  • Chrome said "connection time out"
  • When I tried to connect another computer outside the classroom, it worked well.
  • Some teacher close the web browser, other teachers can connect the server. 



1) you said you have a fast connection.  Perhaps this is a firewall issue.   Here is an experiment:   have everyone use their browser to go to a different Web page; can they do that successfully?   If they can not ALL go to that same Web page, have 1/3 of the class navigate to one Web page, 1/3 to another and 1/3 to yet another.  Can ALL of them load the web pages they were assigned to visit?

If the students can not ALL visit a different web page successfully the problem is probably with the school network...some limitation..see your IT department for help.
If the students can not ALL visit 1/3, 1/3, 1/3 you are probably dealing with a limitation on the number of users.

You comments "Some teacher close the web browser, other teachers can connect the server" seem to indicate there is a limitation on your network to how many individuals can be logged in from that particular network.   It might be something else.  We do know that instructors handle a class size of 40 students with no serious issues so we are interested in what might be the problem too.


Please answer the questions, read the documents and let us know the results.   If you still can not get ALL your class logged on, tell us more please.



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