SFTP in Krusader as user: "Unknown error"

Question

Hello,
I would like to connect to various sftp-servers using Krusader, but most* of my attempts fail, and I get the following error message:
Unknown error:
SFTP error: 1
Execution of the ssh program didn't succeed.
(1st line verbatim, 2nd and 3rd backtranslation.)
Fish now seems to be working, but it was not always so, I used to get:
The process for the fish://<myserver> protocol died unexpectedly.
(verbatim)
Command line ssh/sftp works flawlessly, smb through Krusader too.
However, if I run Krusader as root, both sftp and fish works.
Moving ~/.kde4 or ~/.ssh doesn't help.
Maybe relevant: I use a non-default port for ssh.
I have both kdebase-runtime and kdelibs installed (mentioned in this thread), however I don't have a full KDE installed, I use Openbox. After an sftp attempt, 'ps -e' lists kio_sftp.
(It's possibly not some "recent Syu" bug, I have never tried it under Arch before.)
I'm actually out of ideas how to continue debugging, anybody else?
Thanks in advance.
*Actually it succeeds if it is my very first ssh/sftp activity since the last reboot. So I can reenable sftp-ability in Krusader by rebooting; restarting just Krusader, X or remote sshd doesn't help.

Answer 1

When you send mail to that "bad account", check the ldap access log. Suspect that there's a duplication of mail address with somebody having the same alternate address.
Look at that access log, for the search, and note the result. If "nentries=2", that's the problem
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