Well I have the problem with SSHSecureShell from sss.com too and confirm. I get in by using ssh from linux.
Since I can connenct via SSHSecureShell to OZ 3.3.6-pre-1 I think that this depends on dropear on Zaurus.
This problem can be solved by using OpenSSH. I heard this will be soon in the feed. You could also try the ssh packages from the 3.3.6 feed (I dunno if they work with 3.5.1).
Note that SSH requires more place than dropbear.
Cheers,
Sam