FTP, FTPS & SFTP Consulting

Zwiegnet provides comprehensive expertise across all major FTP protocols — plain FTP (vsftpd/ProFTPd), FTPS (TLS-wrapped FTP), and SFTP (OpenSSH subsystem). We help organizations deploy secure, compliant, and high-performance file transfer services while supporting legacy clients when necessary.

Our file transfer services include:

• vsftpd & ProFTPd Configuration – Highly secure FTP/FTPS servers with chroot jails, virtual users (MySQL/PostgreSQL/LDAP), bandwidth throttling, and passive mode optimization.
• FTPS (TLS Encryption) – Explicit and implicit TLS setups, certificate integration (Let’s Encrypt or commercial), mandatory encryption, and client compatibility.
• SFTP (SSH-based) – OpenSSH sftp-subsystem configuration, chroot directories, key-based authentication, force sftp-only users, and restricted shells.
• Virtual & Database-Backed Users – Authentication via PAM, LDAP, MySQL, PostgreSQL, or flat files for scalable user management without system accounts.
• Security Hardening – Disable anonymous access, enforce strong ciphers, rate limiting, Fail2Ban integration, and compliance (PCI, HIPAA).
• Performance Tuning – Concurrent connections, upload/download limits, data channel optimization, and load balancing for high-volume transfers.
• Integration – Web-based file managers (e.g., FileBrowser, Nextcloud), automation hooks (post-upload scripts), and API access.
• High Availability – Multi-server setups with shared storage (NFS/GFS), load-balanced FTP/FTPS, or clustered SFTP with shared keys.
• Monitoring & Logging – Detailed transfer logging, integration with rsyslog, Prometheus exporters, and alerting on failures or suspicious activity.
• Migration & Modernization – Transition from legacy FTP servers, replacement of insecure plain FTP with FTPS/SFTP, and client/script updates.
• Troubleshooting & Break-Fix – Diagnosis of connection issues, passive port problems, authentication failures, and transfer stalls.

We recommend SFTP or FTPS over plain FTP for security, but support all protocols to meet real-world needs — including legacy client compatibility.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct access to experienced file transfer specialists with production deployments across FTP variants.