sftp login via jEdit failed on new installed AIX 6.1 with ssh from the CD|s

We installed a AIX 6.1 on a new p520. To allow the login via ssh, I installed
the SSH-Package from the CD.

But the open request in jEdit failed with a

java.io.IOException: com.jcraft.jsch.JSchException: failed to send channel request

After searching for the error, I found out, that /etc/ssh/sshd_config had a
wrong path entry for the sftp server.
After setting to /usr/sbin/sftp-server, the login worked via jEdit.