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Security concerns: FTP does not offer encryption for data transfer over the network, which makes it susceptible to snooping and hacking attacks. This can result in sensitive information and data being compromised.

User authentication: FTP does not provide a robust user authentication process, which means that login credentials for accessing FTP servers can be easy to guess or stolen. Authentication can be strengthened through the use of secure FTP (SFTP) or SSH File Transfer Protocol (SFTP), which are more secure alternatives.

Performance and scalability: FTP can be slow when transferring large files and may not scale well with larger workloads.

Compatibility issues: FTP requires a specific set of protocols and ports to be open on firewalls, which may be blocked by security software or firewalls in some network environments.

Lack of functionality: FTP is a file transfer protocol and lacks additional functionality, such as remote file management or collaboration capabilities, which may limit its usefulness for some organizations.