Apologies for any inconvenience!
May I ask if you're using a proxy connection? If so, you'll need to configure your settings in Justinmind to match your proxy.
If you're not using a proxy and you're still seeing this message, check that under Preferences -> Justinmind account -> that it lists your account URL as https://justinmind.com/usernote
If that doesn't fix things, please let us know.
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