Reply To: RP can connect via SSL but M1ToGo cannot anymore

M1 Support Forum RP can connect via SSL but M1ToGo cannot anymore Reply To: RP can connect via SSL but M1ToGo cannot anymore

#5191
Moshe Katz

I watched some network traffic, and I wonder if this might be related:

RP appears to be hardcoded to use TLSv1.2, which is supported by the XEP.

M1ToGo does not specify a protocol level. Instead, it leaves the choice of protocol to the Operating System. It appears that Windows wants to use TLSv1.3, which fails to connect.

If I go to a Linux machine and run openssl s_client -connect IP_OF_M1XEP:2601 -tls1_2, I see that the connection works. However, if I run openssl s_client -connect IP_OF_M1XEP:2601 -tls1_3, I see an SSL Handshake failure on the client side and the “Trace” dialog has the same “Secure SSL negotiation failed, code: -3” error message.

The thing I don’t yet know is why this should change depending on the XEP firmware version.

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