Node default@jabber is started but ejabberd is not running

Hello,

At beginning I'm sorry for my bad english but I'm french.

I installed ejabberd-1.1.1 on a Linux RedHat 4 enterprise in order to test it. Indeed I need a jabber server in my work. I heard that ejabberd was one of best. So I installed ejabberd with the binaries : ejabberd-1.1.1_2-linux-installer.bin which I found in www.process-one.net.

The installation was ok :)
During 3 days I tested many options of ejabberd and I enjoyed it.

Today I have a problem. I can't restart ejabberd. I have a strange message :
" Node default@jabber is started. Status: started "
" ejabberd is not running "

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# ejabberd is the command for ejabberdtcl
[root@jabber ~]# cat .bashrc | grep ejabberd
alias ejabberd='/opt/ejabberd-1.1.1/bin/ejabberdctl'

[root@jabber ~]# ejabberd status
RPC failed on the node default@jabber: nodedown

[root@jabber ~]# ps ax | grep ejabberd-1.1.1
2714 ? S 0:00 /opt/ejabberd-1.1.1/bin/epmd -daemon

[root@jabber ~]# ejabberd start
[root@jabber ~]# ejabberd status
Node default@jabber is started. Status: started
ejabberd is not running

[root@jabber ~]# ps ax | grep ejabberd-1.1.1
2714 ? S 0:00 /opt/ejabberd-1.1.1/bin/epmd -daemon
3253 pts/1 Sl 0:00 /opt/ejabberd-1.1.1/bin/beam -- -root /opt/ejabberd-1.1.1 -progname /opt/ejabberd-1.1.1/bin/erl -- -home /root -noshell -noinput -noshell -noinput -sname default@jabber -mnesia dir "/opt/ejabberd-1.1.1/database/default" -kernel inetrc "/opt/ejabberd-1.1.1/conf/inetrc" -s ejabberd -ejabberd config "/opt/ejabberd-1.1.1/conf/ejabberd.cfg" log_path "/opt/ejabberd-1.1.1/logs/ejabberd.log" -sasl sasl_error_logger {file,"/opt/ejabberd-1.1.1/logs/sasl.log"}
3257 ? Ss 0:00 opt/ejabberd-1.1.1/lib/ssl-3.0.10/priv/bin/linux-x86/ssl_esock

[root@jabber ~]# ejabberd stop
[root@jabber ~]# ejabberd status
RPC failed on the node default@jabber: nodedown

[root@jabber ~]# ps ax | grep ejabberd-1.1.1
2714 ? S 0:00 /opt/ejabberd-1.1.1/bin/epmd -daemon

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There is nothing in the logs :

[root@jabber ~]# ll /opt/ejabberd-1.1.1/logs/
total 0
-rw-r--r-- 1 root root 0 Jul 4 00:30 ejabberd.log
-rw-r--r-- 1 root root 0 Jul 4 00:30 sasl.log

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I tried to reboot my machine but no result.
I tried to kill the epmd process but no result.

I know I can uninstall then reinstall ejabberd but I really wanted understand what's my problem.

Please help me,
Thank you in advance.