FTP
150 File Status OK
The file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer.
When You See This Code
Right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.
How to Fix
No fix needed — this means the transfer is about to start. If the transfer stalls after this reply, check firewall rules blocking the data connection.