ssh compatibility

hi tr64 managers,

i have problem in ssh-ing from T64 to HPUX 
but fine from HPUX to Tru64.

ie fails if  'ssh  xxxx@HPUX' when issuing from Tru64
   but this works ok if from a  putty client on a PC.                      

 the log from HPUX indicates a wrong password
    Failed password for xxxx from 10.20.30.40 port 4447 ssh2   

-------
The reverse of sshing is fine , ie.
   works if  'ssh xxxx@Tru64' when issuing from HPUX


both machine is using protected pwdb and has enhanced security 
activated.

The software versions are :

Compaq Tru64 UNIX V5.1B (Rev. 2650); 
  ssh: SSH Secure Shell Tru64 UNIX 3.2.0
 ----
HP-UX B.11.23 U ia64 
  OpenSSH_3.7, SSH protocols 1.5/2.0, OpenSSL 0.9.7c 30 Sep 2003
  HP-UX_Secure_Shell-A.03.71.006.%ic71N, HP_UX Secure Shell version


thanks in advance for your responses.

fred.