No SSE connection with the user’s UI

The UI fails to establish the connection SSE (server-sent events) The UI uses a permanent connection with the http protocol to receive notifications about the status of calls, users and gateways.

The port used varies for each company and is indicated in the company configuration as “http port”.

Possible causes:

1. The firewall / antivirus of the windows machine blocks outgoing traffic for the port used by the server
2. The network firewall blocks outbound traffic for the port used by the server

Possible solutions:

1. Check the configuration of the software firewall or antivirus and make sure that there are no blocks to the aforementioned port
2. Check your network firewall configuration and make sure there are no blocks to the above port