A hosted upload server, not a poll of yours: SFTP and SCP on port 22, explicit (AUTH TLS, port 21) and implicit (port 990) FTPS - cleartext FTP is refused. Usernames, passwords and SSH keys are managed in the console, with a per-service IP firewall and a browser uploader for people without a client. The login is upload-only: a file leaves the server the moment its upload completes, so nothing sits on it and there is nothing to poll.

DocEvent's channel server matches the incoming file to your configured route, queues it for delivery, and ensures no file is ever lost — even during downstream outages.

Outbound AS2 (RFC 4130) delivery to your partner's AS2 URL. Messages are signed (SHA-256, SHA-384 or SHA-512) and encrypted (AES-256, AES-192, AES-128 or 3DES for legacy partners) using the partner's certificate, and can be compressed. Ask for a synchronous MDN, an asynchronous MDN, or none at all — signed receipts are verified and recorded, and a message whose receipt never arrives is parked for reprocessing instead of being quietly lost. Re-sends carry the same Message-ID, so a partner's duplicate detection suppresses them.