Troubleshooting
Problem
This document details the pros and cons of each TCP application.
Resolving The Problem
This table details the basic pros and cons of each TCP application.
| FTP - SSL | OpenSSH - SFTP |
| Part of base operating system. | LPO (5733SC1) that runs in the PASE environment. Support is through Open Source community. |
| CL programs work well with FTP - SSL. Batch processes are straightforward to configure. | QP2SHELL has limitations that must be programmed around. No provisions to pass command status back to IBM i5/OS. Programs must verify that operation competed. |
| Security through certificates. | Security through RSA or DSA keys. |
| Can access library system and IFS and do basic EBCDIC-to-ASCII conversion for some file types. | Defaults to Integrated File System (namefmt 1); however, can reach library system through use of path. Supports only binary transfer of data. No character conversion. |
| Works well as a client or server. | Works well as a server; however, QSH and QP2TERM/QP2SHELL are not true TTY devices. Requires ssh-keygen to build pre-shared keys without pass phrase, or ssh-agent to store pass phrase data to operate as a client. |
| Some Clients do not work with FTP - SSL natively, requiring the use of third-party software products. | Most UNIX environments support OpenSSH natively. Windows users can use open source products to connect with secure shell servers. |
| A successful file transfer requires two connections (Control & Data) be opened. NAT devices can't peak into the packets to open up the necessary data connection when FTP data is secured with SSL. | There's no separate data connection used with SFTP. All SFTP data is sent/received over a single port e.g. 22. The use of a single port for SFTP makes it a popular choice when file transfers need to be done securely through NAT devices. |
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Historical Number
406673182
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Document Information
Modified date:
18 December 2019
UID
nas8N1015100