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Service available, closing control connection. This may be a reply to any command if the service knows it must shut down. 425: Can't open data connection. 426: Connection closed; transfer aborted. 430: Invalid username or password 431: Need some unavailable resource to process security. 434: Requested host unavailable. 450: Requested file ...
[19] [20] [21] Sometimes, this status code is also used as a response to a blocked request, instead of the more appropriate 403 Forbidden. [22] [23] 421 Misdirected Request The request was directed at a server that is not able to produce a response (for example because of connection reuse). 422 Unprocessable Content
One is that the FTP client and FTP server use the PASV command, which causes the data connection to be established from the FTP client to the server. [14] This is widely used by modern FTP clients. Another approach is for the NAT to alter the values of the PORT command, using an application-level gateway for this purpose.
Below is a list of FTP commands that may be sent to a File Transfer Protocol (FTP) server. It includes all commands that are standardized by the Internet Engineering Task Force (IETF) in RFC 959, plus extensions.
FTP: Abhay Bhushan: 1971: Internet protocol suite: RFC 959 [9] FTP Secure: FTPS: Internet Society: 1997: Internet protocol suite: RFC 2228, 4217 [10] [11] HTTP Secure: HTTPS: Taher Elgamal et al. 1995: Internet protocol suite: RFC 7230 [12] [13] Host Unix Linkage File Transfer: HULFT? 1993 — No: Hypertext Transfer Protocol: HTTP: Tim Berners ...
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Dropbox [21] 2 GB free, +500 MB for referrals up to 18 GB; 1 TB, 2 TB, or unlimited paid [22] 10 GB, Unlimited using client application 20 GB/day free, 200 GB/day paid [23] No No Yes No [24] 30 days by default, 1 year w/ add-on [25] Yes 2 Synchronization, backup and websharing. Does support Linux OS 25 GB free with HTC Sense 4 & 5,
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