OpenSSH_3.5p1 server, PC clients cannot connect

I have setup an OpenSSH_3.5p1 ssh/sftp server on my SunOS 4.1.4 box. I can ssh to it just fine. The problem is SFTP from certain clients.

I can SFTP to it using my OpenSSH_3.5p1 sftp client. I can SFTP to it from MacSFTP from MacSSH.org, version 1.0.5. However, I have several clients that cannot connect. I have had them try CuteFTP Pro v2, v3, WS_FTP Pro v7.62, PuTTy pSFTP. None are able to connect.

WS_FTP Pro gives the error:

  Failed SSH Key Exchange

PuTTy gives the error message:

  Fatal: unable to initialise SFTP: could not connect

CuteFTP just seems to hang there.

I have turned on DEBUG logging and they each appear to stop at different places.

Do you need help?

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I did some searching and increased the Login time from 2 minutes to 5 minutes. No change. I turned off PrivSep. No apparent change. Compression is still on. I run the daemon with '-u0' to increase DNS lookup speed. I have included my config file below my signature.

Does anyone have any idea what I could be doing wrong? I would really like this to work for my PC/Win clients. Please let me know if you need any additional information to diagnose these clients.

Thank you very much in advance.

JohnM

-- 
John Mendenhall
john@surfutopia.net
surf utopia
internet services
-----  sshd_config  -----


#       $OpenBSD: sshd_config,v 1.59 2002/09/25 11:17:16 markus Exp $


# This is the sshd server system-wide configuration file.  See



# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin


# The strategy used for options in the default sshd_config shipped with





#Port 22


Protocol 2

#ListenAddress 0.0.0.0




# HostKey for protocol version 1


HostKey /usr/local/etc/ssh_host_key


# HostKeys for protocol version 2


HostKey /usr/local/etc/ssh_host_rsa_key
HostKey /usr/local/etc/ssh_host_dsa_key

# Lifetime and size of ephemeral version 1 server key


# Logging


SyslogFacility AUTH


#LogLevel INFO


LogLevel DEBUG


# Authentication:



#LoginGraceTime 120


LoginGraceTime 300


#PermitRootLogin yes


PermitRootLogin no


#StrictModes yes


#RSAAuthentication yes

#RSAAuthentication no

#PubkeyAuthentication yes



# rhosts authentication should not be used





# To disable tunneled clear text passwords, change to no here!





# Change to no to disable s/key passwords




# Kerberos options



#AFSTokenPassing no


# Kerberos TGT Passing only works with the AFS kaserver


# Set this to 'yes' to enable PAM keyboard-interactive authentication


#X11Forwarding no


# 20030219 jem turned off Privilege Separation for Putty pSFTP to work


#UsePrivilegeSeparation yes


UsePrivilegeSeparation no

PermitUserEnvironment no


#Compression yes


#MaxStartups 10


# override default of no subsystems


Subsystem       sftp    /usr/local/libexec/sftp-server