I got the 1803 update yesterday and just realize today that I got error on Bitvise SSH. I have multiple VPS, I get same error.
this the error message I received
The SSH2 session has terminated with error. Reason: Error in component session/transport/kexHandler. Error class: Flow, code: ComponentException, message: Exception in component: Windows CNG (x86) with additions: AsymKey: CngAgree: unexpected secretData->cbStruct.
I fixed this by upgrading my Bitvise SSH client from 7.27 to version 7.41.