At WP Engine, we take the security of your sites very seriously, and we strive to keep you aware of any potential issues or vulnerabilities that could impact the sites you entrust to us. Our Engineers have patched a subset of servers to close a vulnerability and with this patch, your SFTP port may have changed to 2222. You can confirm your SFTP port by going to the Installs Page and finding it in the SFTP logins section near the bottom. If you are having trouble connecting to SFTP, please attempt to use port 2222 in your SFTP client.
We appreciate your understanding in this change and apologize for any inconvenience this may have caused. Thank you for letting us serve you.