Internal URL filters identify the referrers that you consider internal to your site. They help traffic sources reports populate data and help filter internal traffic.
A referrer, or referring page, is typically the page from which a visitor entered your site. To avoid skewing data, you can filter out internal referrers. Reports exclude filtered referrers from the Referrers Report, the Referring Domains Report, and other Finding Methods reports.
The most common reason traffic sources reports don't populate data is that the Internal URL Filter List isn't defined. To check which Internal URL Filters have been set up on a report suite, follow these steps. To avoid this, remove the rule listing a period (.) as a filter, and add your own site.
The reason why a period is the default internal URL filter is to allow data to be collected in the Pages report. If hits do not match internal URL filters, all pages come up as Other. A period is always somewhere in the URL, which guarantees the Pages report is populated.
Steps that describe how to add internal URL filters.
Click Analytics > Admin > Report Suites in the Suite header.
Click Edit Settings > General > Internal URL Filters.
In the Internal URL Filters dialog box, type the URL to add to the filter list.
Click Add.
The filter list uses string matching to determine whether to filter the site, so you are not required to specify a complete URL. When specifying the URL, consider the following:
Exclude the protocol identifier (http:// and https://) and www. from the URL.
URL filters are not case-sensitive.
There is no limit to the number of filters you can include.
Include all alias domains in the filter list.
Word filters can exclude any URL that includes that string. For example, specifying car as a filter excludes any referrer with car in its URL.
Reference: https://marketing.adobe.com/resources/help/en_US/reference/internal_URL_filter_admin.html
