Scenario

This Portico Virtual Terminal error might occur if a header is stripped from a browser request or server response.

Solution

Clear your browser cache.

Chrome

1. Close all open browser windows, and then open a new browser window.
2. Navigate to the Tools menu (three dotted lines in the upper-right corner), and then select History.
3. Select Clear Browsing Data from the left-hand side, set the Time Range to All Time, and then ensure Cached Images and Files is selected.
   Note: You might also need to select Cookies, Site Data. However, try just clearing the cache first because clearing cookies and site data will sign you out of most websites.
4. If on a Windows computer, close and re-open Chrome to save your changes.