CUCM DRS backups to a Synology NAS

Has anyone had any experience with doing CUCM DRS backups to a Synology NAS setup for SFTP. I am having problems getting backups from both the CUCM pub and the PLM server. Basically when defining the backup server it cannot connect via SFTP
Strange thing is if that I connect using WinSCP and the same credentials I'm putting into CUCM it works fine.
Any ideas welcome!

I am trying to set up the same thing here.
Everything looks good via WinSCP, can log in upload & download files, create directories, etc.
The CUCM box says:
Unable to save Backup Device successfully. Update failed : Unable to access SFTP server or SFTP server too slow to respond.
I have tried all sorts of values for the path as that is known to be very picky.  None of them make a difference.
I also know it's not "too slow" because that message is returned almost instantly -- no waiting on timeouts.
I did a packet capture on this, which ironically involved me using SFTP to upload the capture file to a Linux box.  The capture shows 13 packets, where there is the initial handshake, then the SSH protocol identifiers, Key Exchange Inits, and then is closed.  The first FIN comes from the synology box, followed by an ACK & FIN from the CUCM.  So this points at the synology not being able to agree with the client and just terminating the connection. 
Digging in furhter & comparing the algorithm lists sent by each, it seems they could not agree on a common cipher.

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