Site Reports

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Site Reports give you valuable information about accesses and
errors to your web site. You will be able to see who has visited your site and
statistics regarding the number of hits to certain pages, and by certain
individuals.
Web Server:
This will show you Wusage, a graphical statistics program. Click this
link to see how many people access your site, and which pages they visited. If
your account has the referrer logs option enabled, you will be able to see exactly how
your visitors reached your site (through a link on a search engine, for
example). You can also view Wusage directly by browsing
http://www.yourdomain.com/wusage
(replace yourdomain.com with your domain name.)

Raw Access Logs:
Access logs show you in text format where accesses to your page are coming
from. Each line will show what IP address the visitor was using while accessing your web site, at what
time they came, and to what page. Your access log is stored in your home directory and is
named access-log.

Error Logs:
Error logs show you the time and
date that someone experienced an error page. If you have error logs enabled, you
can access the file named error-log in your home directory.

Source: http://www.hostingmanual.net/plusmail/sitereports.shtml