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Cognos has 3 main components - Gateway, Application Tier, Content Manager and 1 optional component - Content Store.

When you start the Cognos Server process the Gateway communicates to the Dispatcher (one of the applications in the Application Tier) using Port 80. The dispatcher then uses Port 9300 for internal communication between the other components. There are a few other ports used by Cognos for logging and for stopping the services; they are all listed in the installation guides. If you block access to the ports Cognos uses, then it will not work.

You can always test the content manager and the dispatcher using the following URLs :

• http://localhost:9300/p2pd/servlet - the content manager
• http://localhost:9300/p2pd/servlet/dispatch - the dispatcher

To start configuration utility, use c:\cognos8\bin\COGCONFIG.BAT There you can see the path to log file: c:\cognos8\logs\COGSERVER.LOG

C8 cfg file : cogstartup.xml file in the <c8_location>\configuration directory.

• 9300 : non-SSL Coyote ; content manager and dispatcher
• 9334 : SSL Coyote
• 9399 : tomcat shutdown listener
• 9362 : log server
• 1527 : content database

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Log files can help you troubleshoot problems by recording the activities that take place when you work with a product. Operations performed in IBM Cognos 8 are recorded in various log files for tracking purposes. For example, if you experienced problems installing IBM Cognos 8, consult the transfer log file to learn what activities the installation wizard performed while transferring files. Before you begin viewing log files, determine which ones contain the information that you need. The number of log files and the information that they contain are set by parameters in IBM Cognos Connection and in IBM Cognos Configuration. Use the server administration tool in IBM Cognos Connection to learn about logging categories and how to set the level of detail to log for each category. For more information, see the IBM Cognos 8 Administration and Security Guide. Use IBM Cognos Configuration to specify the size, number, and location of log files, and to configure the properties of the log server. For more information, see the IBM Cognos Configuration User Guide.

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This file consolidates IBM Cognos 8 Special Edition installation and configuration log files for IBM Cognos 8 components and IBM components. The following is an example of the file name format: C8SE_install_date_time.log

This file records the activities that the installation wizard performed while transferring files. The transfer log file is located in the c8_location\instlog directory. The file name identifies the product name, version, and build number, and includes a time stamp. The following is an example of the file name format: tl-C8BISRVR-8.1-0.0-20080901_1122.txt

This file records the components you installed, disk space information, the selections you made in the transfer dialogs, and any errors the installation wizard encountered while transferring components. The transfer summary-error log file is located in the c8_location/instlog directory. The file name identifies the product name, version, and build number, and includes a time stamp. The following is an example of the file name format: tl-C8BISRVR-8.1-0.0-20080901_1122_summary_error.txt

This file records your configuration choices each time you save your property settings. The file name is cogstartup.xml. If you are unable to save your configuration, or are having problems you can revert to a previously saved configuration file. The backup configuration files are located in the c8_location/configuration directory. The following is an example of the file name format for backup configuration files: cogstartup_200811231540.xml

This file is created each time you open IBM Cognos Configuration. It prevents you from opening more than one IBM Cognos Configuration window. If you experience problems opening IBM Cognos Configuration, you can check the c8_location/configuration directory for the cogstartup.lock file. If the file exists and IBM Cognos Configuration is not open, it means that IBM Cognos Configuration did not shut down properly the last time you used it. You can delete the lock file and then open IBM Cognos Configuration.

The default IBM Cognos log file named cogserver.log file, or other log files that you configure to receive log messages from the log server, record information after you start the IBM Cognos 8 service. They are located in the c8_location/logs directory. If you configured another destination for log messages, check the appropriate file or database.

The gateways record errors in the gateway log file, which is located in the c8_location/logs directory.
You can use the gateway log file to troubleshoot problems that prevent the gateway from processing requests or from using encryption.
Symptoms of these problems are user IDs and passwords do not work, single signon does not work, and the dispatcher is running but users receive the following error message: The IBM Cognos BI server is not available.

The gateway log file uses the following naming format : gwgateway_interface.log
{where gateway_interface is cgi, mod (Apache 1.3 module), mod2 (Apache 2.0 module), or isapi}
So valid names are gwcgi.log, gwmod.log, gwmod2.log, gwisapi.log

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Juliol 2011 @ xarxa BISC : si apuntem el browser a la url http://hostname/cognos8/, rebem ...

I en els logs de C8 trobem ...

Start services.msc or sc query and verify 2 "Cognos 8" services are running.

Solution : clean cookies, close browser and reload URL.

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IBM Cognos 8 v4 Business Intelligence information center : url.

Cognos customer center (FAQ, fix pack, forums, best practices) : url.

Cognos Troubleshooting : url, url,

Review the Default Port Settings for IBM Cognos 8 : url.

MustGather: Cognos SDK - Capture SOAP calls. To collect troubleshooting data for IBM Cognos SDK by capturing SOAP calls between the SDK program and the Cognos dispatcher : url.

C8 forum