Hey all,
Thank you for the reports on this. We’ll make sure to pass it along to notify the Diablo 3 team if they didn’t already get an alert for these errors.
Historically this error has been an issue on the server side, so I would not recommend trying any troubleshooting on the user side at the moment. In rare cases this error could also indicate an account specific issue, so if anyone comes across this in the future and there are not widespread reports please create a new thread with the details.
We’ll update this thread when we know more or once the issue has been resolved. Thanks.