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1. Have your host disable name resolving in your sshd and ftp server configurations. (Temporarily for sshd anyway, ftp reverse lookups are a waste of resources)
2. See if a reverse entry for your IP exists and is resolvable. If not, see above.
3. Change either your FTP or SSH port (or both, whatever) on the server and see if you can connect through the alternate port(s).
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