Subscribe hub failed, err : Data cannot be sent because the WebSocket connection is reconnecting

Seeing this error in event logs of every robot server. Guess it’s retrying and auto-resolving. But trying to understand what’s triggering it. Thanks.

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Can you please let me know if you are using any particular TCP port for running the bot or if you are running the code through bot which will use a specific port @Dev4005?

Usually this scenario will get resolved once the machine is restarted. Can you try that

Check if the port you configured is blocked by firewall and other settings.
At the bottom of the event window, please check the details section for more information why it is happening.
And try restarting the machine as suggested by @HareeshMR

Regards,
Karthik Byggari