When upgrading Publish-over-SSH from v1.13 to v1.14, I get the following error when using "Send build artifacts over SSH":

ERROR: Exception when publishing, exception message [Failed to connect session for config [my-server-name]. Message [Session.connect: java.security.InvalidAlgorithmParameterException: Prime size must be multiple of 64, and can only range from 512 to 1024 (inclusive)]]

I have configured this SSH server with user root, remote directory '/' and password authentication without a key.
When I google this error I only get responses regarding the programming of SSH clients, no mention of a misconfiguration of some kind.