Tools
PROT FTP command in Serv-U
This article describes the PROT FTP command available and supported in Serv-U.
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Overview
PROT P refers to the data transfers. Communication with the server is always encrypted if you use FTP over TLS. Communication encrypted: PROT C, Communication+Data encrypted: PROT P. FTP over TLS. To read more, click here (© 2020 FileZilla, available at https://wiki.filezilla-project.org/FTP_over_TLS, obtained on July 08, 2020).
If no PROT command is issued, the data channel will be clear and raw data will be transferred over the data channel. For complete security, a level of Private should be used which encrypts the data channel and ensures its integrity. Supported levels of protection are defined by the security mechanism specified in the AUTH command that initially secured the command channel. Not all levels of protection may be supported by each security mechanism.
This article provides information on Data Channel Protection Level (PROT) FTP command.
After successfully negotiating a protection buffer size, an FTP client might issue the PROT command. The PROT command is used to specify the level of protection used on the data channel. The four levels of protection (in order of security) are defined as the following:
- Clear
- Safe
- Confidential
- Private
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Product section
Resolution
Serv-U supports the PROT command. It is under FTP commands and responses section. Navigate to Domain>Limits&Settings>FTP Settings and find PROT:
For Serv-U to connect to secure connection and traffic automatically is encrypted, consider to enable the Require secure connection before login settings under Domain>Limits&Settings>Limits and Limit Type is Connection.
Note: Serv-U can redirect connection from FTP to FTPS or HTTP to HTTPS to make it more secure. When a user connects on a browser using HTTP, the connection will be redirected to HTTPS automatically, and the same thing goes for FTP.
Common responses