Error

Error 210 means: Prefetch requests are ignored.

You’re using Firefox with Prefetching enabled, and you have told Slimstat to ignore prefetch requests:

https://developer.mozilla.org/en-US/docs/Web/HTTP/Link_prefetching_FAQ

Νο!
Just when they are: Tracking Mode Client
It does not record anything and reports: Tracker Error Code: 0

What’s the URL?

It works very well with the deactivation of CDN.
Thank you very much.

You’re very welcome!