Consistently Getting TNS-12542: TNS:address already in use error.

Hi
We are facing problem with listener service as It crashes with the error TNS-12542.
Once we restart the server it gets started again and work for some 3-4 days.
Than it crashes with the same error.Oracle version is 10g.
Any idea what could be problem?
Thanks in advance.

Its windows2003 server
Version
for 32-bit Windows: Version 10.2.0.1.0 - Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
Oracle Bequeath NT Protocol Adapter for 32-bit Windows: Version 10.2.0.1.0 - Production
Windows NT Named Pipes NT Protocol Adapter for 32-bit Windows: Version 10.2.0.1.0 - Production
Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 10.2.0.1.0 - Production,,
Listener.ora
# listener.ora Network Configuration File: H:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = IN1011)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME =TESTDB1)
(ORACLE_HOME = \\IN1011\h$\oracle\product\10.2.0\db_1\NETWORK\ADMIN)
(SID_NAME = TESTDB1)
(SID_DESC =
(GLOBAL_DBNAME = TESTDB2)
(ORACLE_HOME = \\IN1011\h$\oracle\product\10.2.0\db_1\NETWORK\ADMIN)
(SID_NAME = TESTDB2)
(SID_DESC =
(PROGRAM = TESTDB3)
(SID_NAME = PLSExtProc)
(ORACLE_HOME = \\IN1011\h$\oracle\product\10.2.0\db_1)
(SID_DESC =
(PROGRAM = TESTDB4)
(SID_NAME = selmnewdsn_cc)
(ORACLE_HOME = \\IN1011\h$\oracle\product\10.2.0\db_1)
(SID_DESC =
(GLOBAL_DBNAME = TESTDB5)
(ORACLE_HOME = \\IN1011\h$\oracle\product\10.2.0\db_1\NETWORK\ADMIN)
(SID_NAME = TESTDB5)
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07/01/08 10:04:01 Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
initialized
07/01/08 10:04:01 !!! No valid java compiler found !!!
07/01/08 10:04:01 javac.exe not found under D:\MDK\jre\1.4.2, please use a valid
jdk or specify the location of your java compiler in server.xml using the <java
-compiler .../> tag

If I had to guess, you are starting HTTP Server on the same port as some other service.
BTW, Oracle Express is not a supported platform for Mobile Server.

Consistently Getting TNS-12542: TNS:address already in use error.

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