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FileZilla returns "The first key-exchange algorithm supported by the server is diffie-hellman-group1-sha1, which is no longer secure. Aborting connection." (Robo-FTP Server 3.3.7 and earlier)
Upgrade to Robo-FTP Server 3.3.8 or later to resolve this issue.
Article last updated: 2019-04-28
Tags: Robo-FTP Server, SFTP, SSH