[MPICH] can't set up mpd ring between two nodes

[jetspeed]

Hi all:
	
	I installed mvapich2 , which is with the OFED 1.2.5.
	
	1. when I use mpdboot on a machine, I got :
	  mpdboot_inode02 (handle_mpd_output 359): failed to ping mpd on inode02; recvd output={}
	2.  when I try to use mpd to set up mpd ring, as the user guide of mpich2:
			mpd &                       on node02
			mpd -h node02 -p port       on node01
	I got:
on node01:  (the latter mpd)
inode01_33435 (connect_lhs 621): invalid challenge from inode02 32969: {}
inode01_33435 (enter_ring 566): lhs connect failed
inode01_33435 (run 233): failed to enter ring

on node02:  (the first mpd )
	
inode02_32969: mpd_uncaught_except_tb handling:
  exceptions.TypeError: sequence item 0: expected string, int found
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpdlib.py  733  handle_ring_listener_connection
        newsock.correctChallengeResponse = \
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpdlib.py  488  handle_active_streams        handler(stream,*args)
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpd  266  runmainloop
        rv = self.streamHandler.handle_active_streams(timeout=8.0)
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpd  240  run
        self.runmainloop()
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpd  1344  ?
        mpd.run()



Has anyone encountered this problem?
Thanks in advance.