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I am having trouble transferring files to my FTPS (SSL) site with a secured data channel. The site administrator told me something about data compression and that might be a problem. Does Robo-FTP support compression on a secure SSL data channel?
This discussion applies only to Robo-FTP v2.1.1 and later.
Yes, compression is automatic. However there are three things you can do to disable compression.
1. Add the /sslcomplvl=0 option to the FTPLOGON command.
2. If you are creating the site in the Site Manager, simply check the box for "Disable SSL Compression."
3. Manually create (or edit) a site setting in the Windows registry for the site in question.
The first two options are easy and the recommended way to accomplish this.
However, if you need to connect to this site using the FTP client applet or if you wish to establish this site as the default site (i.e., specify the FTPLOGON command with no arguments) then you must use the Windows registry editor to set a value.
This should only be done if you are using an older version of the software, before we added the "Disable SSL Compression" check box to the site manager.
ONLY EXPERIENCED USERS SHOULD PROCEED FROM THIS POINT.
The registry value that needs to be created or changed is "SSLCompressionLevel". This value (if it exists) is 6 by default and indicates that compression is enabled. To disable it, create the value (if necessary) and set the value to 0. Follow the instructions below to set this value:
1. Find the Robo-FTP settings in the registry in either HKEY_CURRENT_USER (look here first) or HKEY_LOCAL_MACHINE under "SOFTWARE\Robo-FTP\FTP\FTPServers".
2.Each FTP site that you have predefined using the Robo-FTP Configurator appears here under "Server0", "Server1", etc.
3. Find the site in question by expanding each of these locations one by one looking for a matching "ServerName".
4. When you find the desired "ServerName", determine if the "SSLCompressionLevel" value exists or not.
5. If the value exists, double click on it to change its value: 0 = disable, 6 = enable. Values other than 0 or 6 are not recommended.
6. If the value doesn't exist, right click to add a new REG_DWORD value, and set it to 0 or 6 accordingly. Values other than 0 or 6 are not recommended.
Tags: FTPS, SSL, Robo-FTP, Configuration