I see. I don't really want to suggest to remove any of the buttons. My main concern with the current control is that it is too big and I liked the way that navigation worked in the demo.

I have few ideas for you to choose from:

1. Add a control (button) to the existing control that will work the same as described.
   
2. Make the navigation control smaller - consider make it really smaller as whole and additinally (more import), the arrows could threre without the button background and the space around could be transparent (but eventually still available for touch). Maybe some appropriate level of transparency could be useful for the middle part as well.
   
3. Add a "Dot" Button to the center of the screen, it would be an imaginery additinal row. This dot could be useful in readonly mode (without keyboard) too. For sure please add an option (maybe to the top bar next the eye icon) to switch this option on/off because you never know if everybody will like it.

I changed that port manually :), I completely missed the FTPES option... Sorry for confusion.

SOLVED. It works now. 

Following works: instead of trying "FTPS (FTP over SSL)" with port 21 or 990, I had to use "FTPES (FTP over Explicit AUTH SSL)". I can use it with SSL Mode: "Require SSL for all communication" and I have I have to use Connection mode: "Passive (PASV)" otherwise I get "FTP: command PORT failed".

Many thanks Alexander for your time and special kudos to Wikipedia for teaching me about FTPES ;-)

Hi again. I tried it at home. Both servers work in TotalCommander. But I get still the same error on iPad in Textastic even if I am in the same network (using the same ISP)... Both servers are accessible from "FTP 4U" app on my ipad using SSL. In Textastic only FTP (without SSL) works.

No idea. I am connected through a mobile connection now. I will try it at home on ADSL again where I am able to connect to those FTP servers from my desktop computer if there will be any difference. Thanks so far for quick responses.

Yes, I am trying FTPS (FTP over SSL) on port 21 on one server, where it is described to do so. I tried 990 and 21 as well on the other one (where I was told, that both 21 and 990 should work with FTPS - FTP over TLS).

I tried all 3 SSL Modes right now and I still get the same message.