Hi, Did you change anything regarding TLS-version or supported cipher-suites on the last service window that occured on august 17:th?   We have experienced problems with TLS-handshaking on a server running an old Windows server version. It worked fine before the update.   The message that we get from our .NET-code is "Authentication failed because the remote party sent a TLS alert: 'HandshakeFailure'".   ... View more