SFTP Connection and Encryption Algorithms

Unfortunately the SFTP negotiation is a bit cryptic (especially from the dataplane side), the easiest way to figure out specifically what the snap is seeing is to enable the JSCH logging (you'll need to add this to your jcc.jvm_options as well of -DenableJschLogger=True and to then check the log output from the jcc itself those files will contain "JschLogger.java" as the file and will provide the full negotiation details (server and client side). There's also logging in the jcc that indicates what the original pieces were and what the override properties being added were. If you're still facing further issues, please reach out to support they will connect with you to help debug further (and potentially increase the scope to pull in dev as necessary).