IHS Diagnostic Tools and Information 
====================================

`Looking for the download instructions? <install.html>`__

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Mustgathers and known issues by symptom
---------------------------------------

These documents are grouped by external symptom. Each lists recent
problems, their solutions, and outline the information needed to
troubleshoot new problems.

-  `Crashes <gather_crash_doc.html>`__,
   `Hangs <gather_hang_doc.html>`__, `High
   CPU <gather_highcpu_doc.html>`__
-  `Memory Leaks <memoryleak.html>`__
-  `Startup <gather_startup_doc.html>`__ or
   `Shutdown <gather_termination_doc.html>`__ Failures
-  `Installation Failures <gather_install_doc.html>`__
-  `IHS Admin Server <gather_adminserver_doc.html>`__
-  `Other client symptoms <gather_client_doc.html>`__

Mustgather and known issues by feature
--------------------------------------

These documents are grouped by feature. Each listis recent problems,
their solutions, and outline the information needed to troubleshoot new
problems.

-  `Error Documents <errordoc.html>`__
-  `CRL and OCSP support <gather_crl_doc.html>`__
-  `NLS / UTF-8 issues <gather_nls_doc.html>`__
-  `SSL Certificates <gather_certificate_doc.html>`__
-  `SSL runtime <gather_ssl_doc.html>`__
-  `LDAP access control <gather_ldap_doc.html>`__

Performance Tuning
------------------

Performance and scaling information: `IBM HTTP Server performance
tuning <ihs_performance.html>`__

Error message descriptions
--------------------------

More information on common error log messages: `Descriptions for common
error log messages <errorlog.html>`__

FAQ documents
-------------

Frequently asked questions grouped by subject.

-  `Disabling the HTTP TRACE method <http_trace.html>`__
-  `General / Miscellaneous <questions.html>`__
-  `SSL <ssl_questions.html>`__
-  `Cryptographic Hardware <cryptohw.html>`__
-  `Security <security_questions.html>`__ (non-SSL)
-  `mod\_rewrite <rewrite.html>`__
-  `Start/Stop <startstop_questions.html>`__
-  `Upgrading <upgrade_questions.html>`__
-  `WAS Plug-in <plugin_questions.html>`__
-  `rotatelogs / piped loggers <rotatelogs.html>`__
-  `Questions about specific modules not distributed with
   IHS <othermodules.html>`__
-  `Information about security vulnerability
   handling <vulnerabilities.html>`__

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.. rubric:: z/OS specific FAQ documents
   :name: zos-specific-faq-documents

-  `z/OS FAQ <zos_questions.html>`__
-  `z/OS: SAF Expired Password FAQ <saf_expired_password.html>`__
-  `z/OS: Domino Go WebServer (DGW) / IHS 5.3 migration
   FAQs <dgw_migration_faq.html>`__

.. rubric:: FAQ's for related IBM software hosted here
   :name: faqs-for-related-ibm-software-hosted-here

-  `Edge Caching Proxy FAQ's <cp_questions.html>`__

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Misc topics
~~~~~~~~~~~

-  `Using mod\_alias or mod\_rewrite with the WebSphere
   Plug-in <plugin_alter_uri.html>`__
-  `Supported uses of IBM HTTP Server. <support.html>`__
-  `Using IBM HTTP Server V8 with WAS V7. <ihs8was7.html>`__
-  `Diagnosing problems in environments with third-party
   modules <thirdparty.html>`__
-  `Using IBM HTTP Server diagnostic capabilities with
   WebSphere <WebSphere61.html>`__

   -  `Enhanced mod\_mpmstats module
      timings <mpmstats_module_timing.html>`__

-  `preparing for possible problems ahead of time <prepare.html>`__
-  `configuring IHS and the OS to take core dumps <coredumps.html>`__
-  `diagnosing suspected problems with
   mod\_deflate <deflate_diag.html>`__
-  `getting backtraces from core dumps manually <get_backtrace.html>`__

Diagnostic modules for IBM HTTP Server
--------------------------------------

All available diagnostic modules for IBM HTTP Server 7.0 and later are
included in the product installs. They do not require any separate
download.

-  `mod\_net\_trace <http://publib.boulder.ibm.com/httpserv/manual70/mod/mod_net_trace.html>`__
   - trace network activity between IHS and the web browser or other
   client.
   Original documentation from when mod\_net\_trace required a separate
   download is preserved `here <2.0/mod_net_trace.html>`__
-  `mod\_mpmstats <http://publib.boulder.ibm.com/httpserv/manual70/mod/mod_mpmstats.html>`__
   - Monitor server status.
   Original documentation from when mod\_net\_trace required a separate
   download is preserved `here <2.0/mod_mpmstats.html>`__
-  `mod\_backtrace <2.0/mod_backtrace.html>`__ - automatic backtraces
   for child process crashes
-  `mod\_whatkilledus <2.0/mod_whatkilledus.html>`__ - automatic
   collection of information about the request which caused a crash

Feedback
--------

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Provide feedback on the `IBM HTTP Server
forum <http://www.ibm.com/developerworks/forums/forum.jspa?forumID=287>`__
on IBM developerWorks.

Questions about IBM HTTP Server may be posed on
`stackoverflow <http://stackoverflow.com/questions/tagged/ibmhttpserver>`__
and `serverfault <http://serverfault.com/questions/tagged/ihs>`__

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