load host key error:

[Sunil K. Vallamkonda]

I get error:
%SSHD-3-ERROR: Could not load host key: /tmp/ssh_host_dsa_key: Bad file
descriptor
Jan 26 23:58:52: %SSHD-6-INFO: Disabling protocol version 2. Could not
load host key

Everything looks okay, the file exists, (it was generated using command:
ssh-keygen -d -f ssh_host_dsa_key -N '')
I also do 'ls' and find the file exists with permissions:

-rw-------  1 root   group   668 Jan 26 15:53 ssh_host_dsa_key
-rw-r--r--  1 root   group   601 Jan 26 15:53 ssh_host_dsa_key.pub

version i use:
OpenSSH_2.3.1p1
on NetBSD1.4.2


Is this a bug ?  Any suggestions ?

Thank you.