SOLVED: FireFTP / ProFTPd Error ‘Unable to build data connection: Operation not permitted’

Thursday, September 16, 2010

After updating ProFTPd on a server running FreeBSD, certain clients (FireFTP specifically) were able to log in, but not transfer files or retrieve a directory listing. The following error was shown to the client user: 425 Unable to build data connection: Operation not permitted It appears that a recent change in ProFTPd’s default TLS handling… Read more »

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