(The other mechanism is the TLS "session_ticket" extension. This is currently a resume that reuses the session ID in the ClientHello. To successfully resume TLS on the data connection, your TLS implementation must support a TLS resume mechanism which is compatible with Microsoft Schannel. However, Schannel configuration will not affect connections that use SSH, SFTP, or SCP. We do not have control over the implementation details, and its behavior will depend on the version of Windows on which the SSH Server is running, as well as patches you have applied.Īny registry settings you configure for Microsoft Schannel will also apply to FTPS connections handled by Bitvise SSH Server. This means the TLS implementation is relatively opaque to Bitvise. The TLS implementation used by Bitvise is Microsoft Schannel, which is a feature of Windows. In order for Bitvise SSH Server to accept an FTPS data connection, the data connection must successfully resume the TLS session associated with the corresponding control connection. Client did not show fingerprint during SSH host key verification did not verify FTPS certificate by default SSH (SFTP) worked, FTPS did not work because it did not support TLS for data connections. SSH (SFTP) worked, FTPS did not work because it did not support TLS for data connections Client did not verify SSH host keys or FTPS certificates When we checked, it was last updated in 2011. SSH (SFTP) worked, FTPS did not work because it did not support TLS resume for data connections. When we checked, it was last updated in 2014. SSH (SFTP) worked, FTPS did not work due to incompatible algorithms. When we checked, it was last updated in 2016. When we checked, it was last updated in 2010. When we checked, it was last updated in 2010.Ĭlient would disconnect before completing SSL negotiation. We were not able to use the following FTPS clients with Bitvise SSH Server: Product We recommend using WinSCP in SFTP mode.Įnable Site options > Advanced\SSL > Reuse SSL session FTPS fails with WinSCP on older Windows because in that case it does not use TLS resume for data connections. For FTPS, if the SSH Server is behind NAT, then in Advanced settings, Override FTP passive address must be configured for the FTP binding. In ~/.lftp/rc, add line: set ftp:ssl-protect-data yes We were able to use the following FTPS clients with Bitvise SSH Server after adjusting client settings: ProductĮnable Global Options > Security\SSL Security > Reuse cached session for data connection However, our testing has confirmed that the following FTPS clients were compatible with Bitvise SSH Server at some point: Product We cannot guarantee compatibility between all versions of Bitvise SSH Server and each client. Alternately, you can configure FTPS bindings in Advanced settings, under Bindings and UPnP. In SSH Server versions 8.xx, you can enable FTPS in Easy settings, on the Server settings tab. If there is another FTP server on the system, it may be using that port already. An administrator may prefer to use Bitvise SSH Server for only SSH, SFTP or SCP.įTPS requires at least one additional port. Older versions do not support FTPS.įTPS is disabled in the SSH Server by default. Support TLS for data connections, and use TLS resume functionality for data connections.įTPS is available in Bitvise SSH Server versions 8.xx and newer. Support explicit TLS started using AUTH TLS at the beginning of the FTP control connection. To be compatible with Bitvise SSH Server, an FTPS client must: Therefore, Bitvise SSH Server is compatible with FTPS clients more selectively than in the case of SSH, SFTP and SCP clients. FTPS clients vary greatly in the security measures they support for FTP. The FTP protocol has a longer history than SSH and is originally rooted in an insecure, unencrypted design. Therefore, when used with clients supporting SSH, SFTP and SCP, Bitvise SSH Server attempts to be compatible with the widest possible variety of file transfer clients.īitvise SSH Server also supports FTPS - FTP over TLS/SSL. In SSH, compatibility rarely comes at the expense of security. Bitvise SSH Server: Compatibility with FTPS Clients
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