Issue to access FTP

On the FTP server, verify and adjust these settings:

1. Configure FTP bindings and SSL

• In IIS Manager, select the FTP site.
• Open FTP SSL Settings.
• In SSL Certificate, select the installed SSL certificate that should be used for the FTP site.
• Under SSL Policy, choose:
  • Allow SSL connections if both plain FTP and FTPS should be allowed, or
  • Require SSL connections if all clients must use FTPS.

2. Verify FTP binding and port

• In the FTP site’s bindings, ensure the correct IP Address and Port are configured (typically 21 for FTP, 990 for implicit FTPS).
• If using implicit FTPS, configure port 990 as noted in the FTP security settings.

3. Ensure authentication and authorization are set correctly

• In the Add/Configure FTP Site wizard or FTP Security settings:
  • Choose the appropriate Authentication (Anonymous or Basic).
  • Under Authorization, ensure the correct users/groups are allowed and that Read and/or Write permissions are selected as required.
• Confirm that the Windows file system permissions on the FTP root and user folders match the FTP authorization settings.

4. If using user isolation or shared hosting

• When deploying FTP in a shared hosting scenario, configure user isolation so each user is restricted to their directory and cannot navigate above it. Ensure the user’s physical/virtual directory exists and is accessible.

After these adjustments, retry the connection from the client. If the error persists, re-check that the client is using the correct protocol (FTP vs FTPS), hostname, port, and credentials.

References:

• FTP over SSL <ssl>
• FTP Security <security> element
• FTP Site-level Settings <ftpServer>
• Guide to Deploy FTP and Publish with VWD
• Default FTP Security Settings <security>
• Configuring the FTP Adapter
• Known Issues with the FTP Adapter