Can't use SASL with client-side Moxi

This is beta 3:

This works correctly: (sasl_client is just a simple python script that sets/gets an arbitrary number of keys)
./sasl_client.py sasl new_binary:test 10.1.3.88:11211 60

However, if I run Moxi first like this:
/opt/NorthScale/moxi/bin/moxi http://10.1.3.88:8080/pools/default/saslbucketsStreaming/

Then this doesn't work:
[perry@perry ~]$ ./sasl_client.py sasl new_binary:test localhost:11211 60
Traceback (most recent call last):
File "./sasl_client.py", line 35, in ?
mc.sasl_auth_plain(user,password)
File "/home/perry/mc_bin_client.py", line 162, in sasl_auth_plain
return self.sasl_auth_start('PLAIN', '\0'.join([foruser, user, password]))
File "/home/perry/mc_bin_client.py", line 158, in sasl_auth_start
return self._doCmd(memcacheConstants.CMD_SASL_AUTH, mech, data)
File "/home/perry/mc_bin_client.py", line 91, in _doCmd
self._sendCmd(cmd, key, val, opaque, extraHeader, cas)
File "/home/perry/mc_bin_client.py", line 56, in _sendCmd
self.s.send(msg + extraHeader + key + val)
socket.error: (32, 'Broken pipe')