The SSE protocol is used to receive data from the device in real time.
Starting with v2.6.8.dev25, a separate port 81 is used for this.
If you have an SSE error, you should check your firewall and antivirus, they may be blocking this connection by mistake.
If you are accessing the device interface through a proxy, then first of all you should open port 81. Secondly, you should check if the proxy is not caching requests, because SSE does not work with caching.
Also, the proxy may be losing SSE headers, in which case please refer to your proxy manual to add an exception.
If you still can't find an answer to what you're looking for, or you have a specific question, open a new ticket and we'd be happy to help!
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