[Samba] samba login fail

[Robert Ngo]

Hi

i am using samba 3.07 on Redhat enterprise linux 3 as file and print 
server, since yesterday user suddenly cannot login into their samba 
account for windows. There is error message in /var/log/message every 
time a user try to login

Oct 14 09:52:52 linux smbd[5647]: [2005/10/14 09:52:52, 0] 
lib/util_sock.c:get_peer_addr(1000)
Oct 14 09:52:52 linux smbd[5647]:   getpeername failed. Error was 
Transport endpoint is not connected
Oct 14 09:52:52 linux smbd[5647]: [2005/10/14 09:52:52, 0] 
lib/util_sock.c:get_peer_addr(1000)
Oct 14 09:52:52 linux smbd[5647]:   getpeername failed. Error was 
Transport endpoint is not connected
Oct 14 09:52:52 linux smbd[5647]: [2005/10/14 09:52:52, 0] 
lib/util_sock.c:write_socket_data(430)
Oct 14 09:52:52 linux smbd[5647]:   write_socket_data: write failure. 
Error = Connection reset by peer
Oct 14 09:52:52 linux smbd[5647]: [2005/10/14 09:52:52, 0] 
lib/util_sock.c:write_socket(455)
Oct 14 09:52:52 linux smbd[5647]:   write_socket: Error writing 4 bytes 
to socket 5: ERRNO = Connection reset by peer


what can be causing this problem, samba start with no error.

please help