Live update gets blocked?

I have followed the instructions here: docs.dhtmlx.com/scheduler/live_update.html

It works perfectly, half of the time. The other half, it doesn’t even load.

crm.vantechs.com/login.php

user:admin
pass:admin

In which browser issue occurs for you ?
I have checked the above url and live update on test page works without any errors.

hello,

I think we may have resolved this problem. It was working with the port 8008. When the blocking occurred for some locations/computers, 8008 was being reported as closed in those locations only, which is weird. Reconfiguring the ports seems to have fixed it. Thanks for the reply, and I will update this post if the problem comes back.