Smart List does not recognize a valid URL

[#1]

Issue

The Smart List in a Campaign gives 'Invalid URL' error for a valid URL (non-Marketo landing page URL).

Solution

To make sure non-Marketo landing page URL will show up in Smart List's filters, the following steps have to be done.

1. Make sure the Marketo Munchkin Tracking code is implemented and placed within the non-Marketo webpages.
2. The non-Marketo URLs would show in the filter if a known lead/person has visited the web page and tracked into the activity log. Therefore, make a lead/person and visit the webpage to allow Marketo to track and log that URL visit.