I moved a few of you here since this all seems to be similar reports and the title has been adjusted to reflect this issue more clearly. Please note that the BLZBNTBTS00000011 (digital signature) error is different from the BLZBNTBGS80000011 (can’t login) error. The error reported here appears to be with the BLZBNTBGS80000011, which is a connection issue to our authentication servers. We are seeing some reports with connecting to our web services as well.
We are seeing this across different regions and ISPs, some being Telmex, India (Alliance ISP), and Brazillian ISPs. We are currently gathering information for this issue. If you are running into this issue, please provide the WInMTR test requested above.