Many people and companies use a combination of the two to benefit from the benefits while addressing their shortcomings. The authentication methods and list of commands are different for both protocols. SFTP has greater compatibility and adoption. FTPS file transmissions are multiple times faster than those made using SFTP. You will therefore have to open a range of ports in your firewalls to allow for FTPS connections, which can be a security risk for your network. Every time a file transfer request or directory listing request is made, another port number needs to be opened for the data channel. The first port for the command channel is used for authentication and passing commands. SFTP needs only a single port number for all SFTP communications, making it easy to secure. SFTP works seamlessly with firewalls, but its binary data transmissions are not suitable for logging. You should keep the following details in mind before selecting a protocol: - SFTP is inherently secure and fully encrypted, while FTPS adds a layer of encryption using SSL or TLS. Although both secure protocols have their pros and cons, we recommend SFTP due to its better usability with firewalls. FTP Secure (FTPS)? SFTP and FTPS are popular secure file transfer protocols for transferring files over public and private networks. It is required that your private key files are NOT accessible by others.Ĭhanging the file permission as described above solved the problem in FileZilla and for using SSH from a terminal window.What are the Differences Between SSH File Transfer Protocol (SFTP) vs. The following message is displayed that describes why this problem is occurring: WARNING: UNPROTECTED PRIVATE KEY FILE! 0777 for '/home/user/.ssh/id_rsa' are too open. If the following command is entered in the terminal window before changing the file permissions: ssh-add Look under “Simple Solution” further down the page. This solution is from the following web page, but was not the answer that was accepted on the page. It was just a matter of changing file permissions of the key file found in ~/.ssh/ as follows: chmod 600 ~/.ssh/id_rsa In my case, the solution was very simple. After switching back to Linux Mint 18.3, the problem disappears. Using the same login credentials and SSH key on any new Ubuntu based Linux distribution caused the login error. It also happens on newer versions of Ubuntu, but not on the latest Linux Mint Debian. ![]() The following paragraphs describes how the problem happened to me.Īfter moving from Linux Mint 18.3 to Linux Mint 19.1, this error occurred when trying to SFTP into a remote server. Attempting to SSH from the command line gave the following error: sign_and_send_pubkey: signing failed: agent refused operation How the FileZilla SFTP Connection Error Occurred Further to this it was not possible to SSH into the server from the command line using the SSH key. SSH was set up in FileZilla using the following tutorial: Īfter changing Linux distribution versions (on the client side, not the server), FileZilla would no longer connect, but displayed the error messages instead. FileZilla SFTP Connection Error MessagesĪs can be seen in the image, two messages that appear are:Įrror: Pageant failed to answer challengeĮrror: Could not connect to server SSH Setup The image below shows the two messages that appear in FileZilla when trying to SFTP into a remote server. Error: Pageant failed to answer challenge Message in FileZilla
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