sftp hangs on tru64 5.1A

Hi,

I'm having a problem with an sftp client
on a Tru64 5.1A box.  The ssh client can
connect to a remote host OK e.g.

---snip---
# ssh root@css-ps
root@css-ps's password:
[root@css-ps root]#
--snip---

But when I sftp, the client hangs.  Debug
output gives the following:

---snip---
# sftp -vvv root@css-ps
Connecting to css-ps
OpenSSH_4.0p1, OpenSSL 0.9.7f 22 Mar 2005
debug1: Reading configuration data /usr/local/ssh/etc/ssh_config
debug3: Seeding PRNG from /usr/local/ssh/libexec/ssh-rand-helper
---snip---

And this is where the sftp client hangs.
So I figured maybe there's something wrong
with ssh-rand-helper.  When I run it from
the command line it looks OK:

---snip---
# /usr/local/ssh/libexec/ssh-rand-helper
67c1ac7c7c12e4c76873c7af0ca4efbb32c292213ad4b6af1bc465bf0bacac6a5e3a8f108419fc10739fe687475746d6
---snip---

It's generating 48 bytes of entropy a in
couple of seconds.

Has anyone had similar problems?

NOTE:

Here's how my ssh build was configured.
I've recreated the problem with both
openssh-4.0p1 and openssh-3.9p1.

---snip---
OpenSSH has been configured with the following options:
                     User binaries: /usr/local/ssh/bin
                   System binaries: /usr/local/ssh/sbin
               Configuration files: /usr/local/ssh/etc
                   Askpass program: /usr/local/ssh/libexec/ssh-askpass
                      Manual pages: /usr/local/ssh/man/manX
                          PID file: /var/run
  Privilege separation chroot path: /var/empty
            sshd default user PATH: 
/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/ssh/bin
                    Manpage format: man
                       PAM support: no
                 KerberosV support: no
                 Smartcard support: no
                     S/KEY support: no
              TCP Wrappers support: no
              MD5 password support: no
                   libedit support: no
       IP address in $DISPLAY hack: no
           Translate v4 in v6 hack: no
                  BSD Auth support: no
              Random number source: ssh-rand-helper
     ssh-rand-helper collects from: Command hashing (timeout 200)

              Host: alphaev68-dec-osf5.1
          Compiler: cc
    Compiler flags: -g
Preprocessor flags: -I/home/stepowsk/builds/openssl-0.9.7f/include 
-I/home/stepowsk/builds/zlib-1.2.2
      Linker flags: -L/home/stepowsk/builds/openssl-0.9.7f 
-L/home/stepowsk/builds/zlib-1.2.2
         Libraries:   -lcrypto -lrt -lz  -lsecurity -ldb -lm -laud
---snip---