The TLS protocol defined fatal alert code is 48.


I'm keep getting this error the last couple of days in the event log: "A fatal alert was received from the remote endpoint. The TLS protocol defined fatal alert code is 48."

The error means: "Received a valid certificate chain or partial chain, but the certificate was not accepted because the CA certificate could not be located or could not be matched with a known, trusted CA. This message is always fatal."

I know it's not directly related to Telligent (although one of the reports about this error was also from someone running Zimbra/Telligent). So I hoped that someone here maybe knows this error, and more important, how to get rid of it.

The error started after I rebooted the first time after upgrading to 10.1.6.