![]() ![]() But with Passive FTP, the client cannot decide on which port to use. ![]() ![]() Thus, Passive FTP is now the de-facto standard. ![]() With Passive FTP, it’s the opposite: the client opens additional connections to the server. This is not suitable for clients behind firewalls or NAT routers. However, with Active FTP the server will connect to the client. The two numbers at the end are the higher and lower 8 bit of the 16 bit port number. SFTP - allowed: if SSH is allowed, not specifically supported/detected.įTPs implicit - not used/outdated: it is not supported.įTPs explicit - adjustments needed: as above.Only with Active FTP can the client decide on which ports to use, using the PORT command. SFTP - not used: it can be manually allowed by allowing port 115. Once the firewall allows the session for the data channel, the traffic will pass whether encrypted or not.įTP and TFTP are functioning through their corresponding session-helpers.ĭeleting these session-helpers may prevent the correct ports from being open. Secure data channel: requested by PROT command (not enabled by default by the above commands concerning the command channel). If FortiGate has no 'deep-inspection' enabled, it can not know these ports and allow the traffic.ĭeep-inspection is required in the policy, and proxy-profile must also be adjusted for scanning to find out these ports. The ports used for data (clientserver) are negotiated through this channel. Secure command channel: requested by AUTH TLS (explicit) or AUTH SSL (implicit) commands. Separate generic SSL session for data transfer using dynamic ports. 'Explicit FTP Proxy' does not work for FTPS prior to FortiOS 6.2.1 (for the same internal ID as above).ġ) FTPs-implicit (outdated) -the entire FTPS session is encrypted uses: FortiGate can't differentiate based on the embedded signature of the sFTP from SSH.Ī custom signature is needed to block SSH but allow SFTP ( Technical Tip: How to block SSH but allow SFTP using the same TCP port 22).įTPs - FTP+Authentication (FTP over TLS or SSL extension of FTP protocol: uses :įortiOS support for FTPs is introduced starting with FortiOS 6.4 (and not supported in versions older than 6.4, for Mantis 532698). SFTP is not supported/detected by the FTP signature (564518). SFTP - Secure FTP (or 'FTP over SSH' extension of SSH protocol): uses SSH port 22 Nowadays SFTP should read 'sFTP' and refers to 'Secure FTP'. Protocol not used anymore (assigned Historic status by the IETF = not used anymore). SFTP - Simple FTP (RFC913): uses port 115. TFTP - Trivial File Transfer Protocol ( RFC 1350): uses UDP 69 tftp session-helper operates as above. FortiGate opens the session expectation accordingly). (FTP helper in FortiGate checks the port because the FTP command port is not encrypted. Passive: client tells the server which port to use for data. (default mode uses port20 not suitable if Firewall does not explicitly opens this port). Active: server tells the client the port to use for data. Technical terms are explained in relation to what firewall ports need to be open to allow the traffic.įTP - File Transfer Protocol: uses TCP port 21 for command and TCP port 20 for data transfer. It contains the basic mode of operation, differences, and explanations. This article describes the FTP suite of protocols (FTPs, sFTP, SFTP). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |