I have WordPress blogg running on a ISP where I have installed the plugin wp-piwik.
I have a Synology NAS behind a firewall where I have installed piwik. The firewall redirect port 8030 to the NAS with port 80. I can reach piwik with the following url: mydomain.com:1224/piwik (both domain name and port number are other than the example). I can logon and see my piwik installation.
I see my auth token. Then I login to my WordPress installation and tries to configure piwik with the url and auth token. When I save config I get an error message saying I need to check my url or auth token.
Problem solved. The port number that I used from WordPress to my firewall (8030) was closed by my ISP that hosts the WordPress server. The port 8080 was open and when I used that one it worked directly.
It was I who did not understand how the ISP’s firewall was configured.
With normal update procedure I only get Piwik 2.2 and not the 2.5. At least not yet.