How to fix cache disable problem after installing w3 total cache plugin?

Caching only works for static unchanging content like plain HTML pages and images.  URL with query strings maybe returning posts from your database and the cache module has no way of knowing whether the database info has changed so it does not cache that page.  When you're logged in and POSTing new info, those pages should not be cached either because they also can contain changed info.

sorry I post the wrong results I meant:

Served from: nurit.chicagonewshub.com @ 2011-08-08 20:06:33 -->



<!-- W3 Total Cache: Page cache debug info:

Engine:             disk (enhanced)

Cache key:          _index.html

Caching:            disabled

Reject reason:      Requested URI has a trailing slash

Status:             not cached

Creation Time:      2.446s

Header info:

X-Pingback:         http://nurit.chicagonewshub.com/xmlrpc.php

Content-Type:       text/html; charset=UTF-8

X-Powered-By:       W3 Total Cache/0.9.2.3

Also attches is the compatibility Test:

Legend:
Installed: Functionality will work properly
Not detected: May be installed, but cannot be automatically confirmed
Ok: Current value is acceptable.
Yes/No: The value was successful detected.

Server modules and resources:
Plugin Version: 0.9.2.3
PHP Version: 5.2.17 (PHP5 required for Minify, Rackspace CloudFiles, Microsoft Azure support)
Web Server: Apache
FTP functions: Installed (required for Self-hosted (FTP) CDN support)
Multibyte String support: Installed (required for Rackspace Cloud Files support)
cURL extension: Installed (required for Amazon S3, Amazon CloudFront, Rackspace CloudFiles support)
zlib extension: Installed (required for compression support)
Opcode cache: Not installed
Memcache extension: Not installed
HTML Tidy extension: Installed (required for HTML Tidy minifier suppport)
Mime type detection: Installed (mime_content_type) (required for CDN support)
Hash function: Installed (hash) (required for NetDNA purge support)
Safe mode: Off
Open basedir: Off
zlib output compression: Off
mod_deflate: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_env: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_expires: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_headers: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_mime: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_rewrite: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_setenvif: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
WordPress Resources

/.htaccess: OK
/wp-content: OK
/t/wp-content/uploads/2011/08: OK
Fancy permalinks: /archives/%post_id%
WP_CACHE define: Defined (true)
URL rewrite: Enabled
Network mode: No

The problem is that I'm pretty compused with how would I know if its working and I enabled only page cache and browser cache to start see what happen and I got this output form the debug mode that saying that that caching is disables. also even that I did chose the set expiration option in the compatibility Test  the results are:


mod_deflate: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_env: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_expires: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_headers: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_mime: Not detected (required for Page Cache (enhanced mode) and Browser Cache)
mod_rewrite: Not detected (required for Page Cache (enhanced mode) and Browser Cache)


what are you seeing in  cache module that indicate that it work properly?

All the pages that you have shown to be disabled Should be disabled, they should Not be cached.  Many things should not be cached and that's what it is showing you.  I'm not sure about the 'mod's except that if 'mod_rewrite' was not installed and working, you would be having other problems with Wordpress.

Im still not sure about how W3 total cache plugin works

Like I said, it works mostly on static content like any caching.  If you read here http://wordpress.org/extend/plugins/w3-total-cache/faq/ , you will see that it has features that can benefit large sites by using CDN.  CDN, Content Delivery Networks, are subscription services that you have to pay for.  You also would need to go thru all of the steps involved in adapting your site including thing like running javascript and CSS files thru their 'minifyer'.

Though it is a 'plugin', it is not necessary an instant benefit.