Alors j'ai modifier mon fichier
/usr/share/pymsnt/src/legacy/msn/msn.py comme suit
MSN_PROTOCOL_VERSION = "MSNP11" # protocol version (Suite a une modification du protocol de msn du 8mars 2008 
)
MSN_PORT = 1863 # default dispatch server port
MSN_MAX_MESSAGE = 1664 # max message length
MSN_CVR_STR = "0x040c winnt 5.1 i386 MSNMSGR 7.0.0777 msmsgs"
MSN_AVATAR_GUID = "{A4268EEC-FEC5-49E5-95C3-F126696BDBF6}"
MSN_MSNFTP_GUID = "{5D3E02AB-6190-11D3-BBBB-00C04F795683}"
J'ai aussi modifier maconfig jabber
override_global.
override_local.
override_acls.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ucf section
%% Admin user
{acl, admin, {user, "admin", "jabber.test"}}.
%% Hostname
{hosts, ["jabber.test"]}
{5557, ejabberd_service, [{ip, {127, 0, 0, 1}},
{access, all},
{host, "msn.jabber.test", [{password, "secret"}]}]},
et mon fichier pymsnt
<!-- The JabberID of the transport -->
<jid>msn.jabber.test</jid>
<!-- The public IP or DNS name of the machine the transport is running on -->
<!-- This is needed for file transfer!! -->
<host>0.0.0.0</host>
<!-- The IP address of the main Jabber server to connect to -->
<mainServer>127.0.0.1</mainServer>
<!-- The TCP port to connect to the Jabber server on (this is the default for Jabberd2) -->
<port>5557</port>
<!-- The authentication token to use when connecting to the Jabber server -->
<secret>secret</secret>
<!-- Use Jabber.com's XCP component protocol extensions. -->
<!-- <useXCP/> -->
<!-- The default language to use -->
<lang>fr</lang>
Je ne sais plus quoi faire...