Problems with connecting with it.sauronsoftware.ftp4j.FTPClient to SFTP

155 Views Asked by SAFSAF SAFSAF At 24 April 2025 at 15:27

I am having problems connecting with it.sauronsoftware.ftp4j.FTPClient.

I want to use SFTP but always get errors.

If I use:
```
sftpClient.setSecurity(FTPClient.SECURITY_FTPES)
```
I get: ERROR c.l.datamanager.Ftp4jFTPTask - it.sauronsoftware.ftp4j.FTPIllegalReplyException ERROR c.l.datamanager.Ftp4jFTPTask - java.lang.IllegalStateException: Client not connected
If I use
```
sftpClient.setSecurity(FTPClient.SECURITY_FTPS);
```
I get: ERROR c.l.datamanager.Ftp4jFTPTask - javax.net.ssl.SSLException: Unsupported or unrecognized SSL message c.l.datamanager.Ftp4jFTPTask - java.lang.IllegalStateException: Client not connected

Please let me know how I can use SFTP in it.sauronsoftware.ftp4j.FTPClient.

There are 1 best solutions below

Martin Prikryl On 02 August 2023 at 13:33

FTPES is not SFTP. You cannot use FTP(E(S)) library to connect to an SFTP server. FTP and SFTP are two completely different protocols.

You have to use an SFTP library. See Java SFTP Transfer Library