Dead conection detection and sqlnet.ora

Question

Hello,
I´m having some doubts regarding the sqlnet.ora.
I´m configuring the sqlnet.expire_time=10 parameter in sqlnet.ora, restarted the listener and then I connected via a web conection and turned off my computer (client connection)
Sometimes in 18 or 20 minutes the connection closes, sometimes it remains connected for hours. I turned the trace on and I see a message that the net service read the sqlnet.expire_time = 10 parameter.
What could be wrong ? Anybody here had this kind of problems configuring dead conections detection ?
Another doubt. How can I set a inactivity time ? for example , if the user don´t make a query in 30 minutes he´s disconected... I already tried it configuring in Enterprise manager but it also failed.
SQLNET.EXPIRE_TIME
Purpose:
Determines time interval to send a probe to verify the session is alive
Default: None
Minimum Value: 0 minutes
Recommended Value: 10 minutes
Example:
sqlnet.expire_time=10
Thank you in advance,
Felipe

Answer 1

looking at the trace files we can see that the expire time is configured to 5 minutes . But making tests (like disconecting the net cable) I see a user conected and the 20 after 20 minutes it still conected ...
--- TRACE CONFIGURATION INFORMATION FOLLOWS ---
[13-SEP-2005 13:58:50:591] New trace stream is /oracle/db/9.2.0.4/network/admin/trace/svr_22551.trc
[13-SEP-2005 13:58:50:591] New trace level is 6
[13-SEP-2005 13:58:50:591] --- TRACE CONFIGURATION INFORMATION ENDS ---
[13-SEP-2005 13:58:50:591]
--- PARAMETER SOURCE INFORMATION FOLLOWS ---
[13-SEP-2005 13:58:50:591] Attempted load of system pfile source /oracle/db/9.2.0.4/network/admin/sqlnet.ora
[13-SEP-2005 13:58:50:591] Parameter source loaded successfully
[13-SEP-2005 13:58:50:591]
[13-SEP-2005 13:58:50:591] -> PARAMETER TABLE LOAD RESULTS FOLLOW <-
[13-SEP-2005 13:58:50:591] Successful parameter table load
[13-SEP-2005 13:58:50:591] -> PARAMETER TABLE HAS THE FOLLOWING CONTENTS <-
[13-SEP-2005 13:58:50:591] SQLNET.EXPIRE_TIME = 5
[13-SEP-2005 13:58:50:591] TRACE_DIRECTORY_SERVER = /oracle/db/9.2.0.4/network/admin/trace
[13-SEP-2005 13:58:50:591] SQLNET.ENCRYPTION_TYPES_SERVER = (RC4_128)
[13-SEP-2005 13:58:50:591] SSL_CIPHER_SUITES = (SSL_RSA_EXPORT_WITH_DES40_CBC_SHA, SSL_RSA_EXPORT_WITH_RC4_4
0_MD5)
[13-SEP-2005 13:58:50:592] SQLNET.ENCRYPTION_TYPES_CLIENT = (RC4_128)
[13-SEP-2005 13:58:50:592] WALLET_LOCATION = (SOURCE = (METHOD = FILE) (METHOD_DATA = (DIRECTORY = /oracle/d
b/9.2.0.4/network/admin)))
[13-SEP-2005 13:58:50:592] TRACE_LEVEL_SERVER = admin
[13-SEP-2005 13:58:50:592] NAMES.DIRECTORY_PATH = (TNSNAMES, ONAMES, HOSTNAME)
[13-SEP-2005 13:58:50:592] sqlnet.crypto_seed = fewkpfrepgomrepogmropegjerpogjpejvvmmrpm
[13-SEP-2005 13:58:50:592] SQLNET.CRYPTO_CHECKSUM_TYPES_CLIENT = (MD5)
[13-SEP-2005 13:58:50:592] SQLNET.CRYPTO_CHECKSUM_TYPES_SERVER = (MD5)
[13-SEP-2005 13:58:50:592] SSL_VERSION = 3.0
[13-SEP-2005 13:58:50:592] SQLNET.CRYPTO_CHECKSUM_SERVER = accepted
[13-SEP-2005 13:58:50:592] SQLNET.ENCRYPTION_CLIENT = accepted
[13-SEP-2005 13:58:50:592] SSL_CLIENT_AUTHENTICATION = TRUE
[13-SEP-2005 13:58:50:592] NAMES.DEFAULT_DOMAIN = sids.mg.gov.br
[13-SEP-2005 13:58:50:592] --- PARAMETER SOURCE INFORMATION ENDS ---
[13-SEP-2005 13:58:50:592]
--- LOG CONFIGURATION INFORMATION FOLLOWS ---
[13-SEP-2005 13:58:50:592] Log stream will be "/oracle/db/9.2.0.4/network/log/sqlnet.log"
[13-SEP-2005 13:58:50:592] Log stream validation not requested
[13-SEP-2005 13:58:50:592] --- LOG CONFIGURATION INFORMATION ENDS ---
If anybody here experienced this same problem please let me know..