Hi,
We are seeing a lot of the following errors on an IIS 8.5 host with an SSL certificate:
A fatal alert was generated and sent to the remote endpoint. This may result in termination of the connection. The TLS protocol defined fatal error code is 20. The Windows SChannel error state is 960.
The problem is reproducible about 1 in 100 times on multiple hosts in multiple networks which makes me think it is a server-side issue rather than a client-side one. That's despite the fact 'error code 20' is 'Received a record with an incorrect MAC'.
The server and cert were all fine - the problem has only be occurring since a reboot.
Does anyone have any ideas?