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I'm modifying an application embedded FTP server I have previously written for a customer to support FTPS and while I have implicit mode working by passing a SecureServerSocket to the TCPSocketServer, I want to support Explicit mode where the connection start as a regular socket connection, and when receiving a AUTH TLS, switch the StreamSocket to a SecureStreamSocket and send a server hanshake.

I have attempted to use the attach method, but it seem to send a client hand shake rather than server one. So then I tried to create a server context when creating the SecureStreamSocket, but get "GnuTLS error -19: An unexpected TLS handshake packet was received" when trying to connect from filezilla.

const Poco::Net::Context::Ptr ctx = new Poco::Net::Context(Poco::Net::Context::SERVER_USE, "", "", "", Poco::Net::Context::VERIFY_NONE, 9, false, "ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH"); 
SecureStreamSocket *test = new SecureStreamSocket(ctx);
test->attach(socket());
Have anyone successfully transition a already established POCO TCPServer connection to Secure connection and if so, how did you do it - any hints would be helpfull. 
                SecureStreamSocket has some static functions to attach a StreamSocket to a SecureStreamSocket.  Like static SecureStreamSocket attach(const StreamSocket& streamSocket,....  But I think you want to use it like SecureStreamSocket test = SecureStreamSocket::attach(yourSocket...
– Okkenator
                Apr 3, 2020 at 16:33
                thank for pointing this out, but the result is the same: GnuTLS error -19: An unexpected TLS handshake packet was received.
– Mikaelo
                Apr 6, 2020 at 16:51
                After assigning a error handler to Poco, it logs the following error at the time of the attach:  error:141A10F4:SSL routines:ossl_statem_client_read_transition:unexpected message
– Mikaelo
                Apr 6, 2020 at 16:58
        
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