OpenSSH problem on OpenBSD 3.6

[Open BSD For Ever <openbsdforever_(_at_)_free_(_dot_)_fr>]

Hi,

I have configured OpenSSH on OpenBSD 3.6,  all has worked until today; 
when I try to connect my host, I don't get the shell prompt and Ctrl-C 
doesn't work, but when I use "ssh -l user host /bin/ksh" I can use some 
shell commands.
Also, I get this two messages on auth.log

Nov  2 15:13:20 Fugu sshd[14007]: Accepted password for user from 
192.168.1.32 port 56460 ssh2
Nov  2 15:13:20 Fugu sshd[27674]: error: /dev/ttyp0: Interrupted system 
call
Nov  2 15:13:20 Fugu sshd[27674]: error: open /dev/tty failed - could 
not set controlling tty:
Device not configured

I have checked the /dev/tty and it is set to 0666. I don't understand, 
I have not modified anything since the time it was working.

What's happen ?

Bests regards