Oracle express hang up when two or three users are using the same login.

For developer purposes, we installed the last version of XE, and we are trying to run a small client-server application, but using the same user: login and password in two different remote PC's. The database is installed in an PC dual core with Windows XP SP2 the other PC´s are in the same local area network. The application works fine when the first (doesn't matter wich PC) but when the second or third user tries to connect the database the access from the others crashes.
Is there a security issue or user limitation in XE to avoid the same login in several remote PC´s.? Have I change a parameter?

You're right I found "alert_xe.log".
I don't understand all the messages, but I notice: the "Warning: inbound connection time out". and "LICENSE_MAX_SESSION = 0 LICENSE_SESSIONS_WARNING = 0"
I copied part of the alert_xe.log as following:
Fri Feb 08 20:30:51 2008
WARNING: inbound connection timed out (ORA-3136)
Fri Feb 08 20:32:27 2008
Memory Notification: Library Cache Object loaded into SGA
Heap size 2208K exceeds notification threshold (2048K)
KGL object name :XDB.XDbD/PLZ01TcHgNAgAIIegtw==
Fri Feb 08 20:32:58 2008
WARNING: inbound connection timed out (ORA-3136)
Fri Feb 08 20:38:19 2008
WARNING: inbound connection timed out (ORA-3136)
Dump file c:\oraclexe\app\oracle\admin\xe\bdump\alert_xe.log
Fri Feb 08 20:39:28 2008
ORACLE V10.2.0.1.0 - Production vsnsta=0
vsnsql=14 vsnxtr=3
Windows XP Version V5.1 Service Pack 2
CPU : 2 - type 586
Process Affinity : 0x00000000
Memory (Avail/Total): Ph:758M/1014M, Ph+PgF:2289M/2444M, VA:1944M/2047M
Fri Feb 08 20:39:28 2008
Starting ORACLE instance (normal)
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
Picked latch-free SCN scheme 2
Using LOG_ARCHIVE_DEST_10 parameter default value as USE_DB_RECOVERY_FILE_DEST
Autotune of undo retention is turned on.
IMODE=BR
ILAT =24
LICENSE_MAX_USERS = 0
SYS auditing is disabled
ksdpec: called for event 13740 prior to event group initialization
Starting up ORACLE RDBMS Version: 10.2.0.1.0.
System parameters with non-default values:
processes = 200
sessions = 225
__shared_pool_size = 79691776
__large_pool_size = 8388608
__java_pool_size = 4194304
__streams_pool_size = 0
spfile = C:\ORACLEXE\APP\ORACLE\PRODUCT\10.2.0\SERVER\DBS\SPFILEXE.ORA
sga_target = 268435456
control_files = C:\ORACLEXE\ORADATA\XE\CONTROL.DBF
__db_cache_size = 171966464
compatible = 10.2.0.1.0
db_recovery_file_dest = C:\oraclexe\app\oracle\flash_recovery_area
db_recovery_file_dest_size= 10737418240
undo_management = AUTO
undo_tablespace = UNDO
remote_login_passwordfile= EXCLUSIVE
dispatchers = (PROTOCOL=TCP) (SERVICE=XEXDB)
shared_servers = 4
job_queue_processes = 4
audit_file_dest = C:\ORACLEXE\APP\ORACLE\ADMIN\XE\ADUMP
background_dump_dest = C:\ORACLEXE\APP\ORACLE\ADMIN\XE\BDUMP
user_dump_dest = C:\ORACLEXE\APP\ORACLE\ADMIN\XE\UDUMP
core_dump_dest = C:\ORACLEXE\APP\ORACLE\ADMIN\XE\CDUMP
db_name = XE
open_cursors = 300

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