What I meant to ask was, what have caused those servers to cache a negative result.
The app.dziennik.edu.pl domain was a CNAME to ghs.google.com from the start, and it is set-up for a couple of months now. My other domain that have the same issues www.bravelabs.pl have been setup and untouched for at least 10+ months. Where is the fault? Is it mine? How can I make sure this will go away and never come back? PS. It seems it may be the issue with google infrastructure: https://groups.google.com/d/topic/google-appengine/zjEeCeyhN20/discussion -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/UQUE2bIz9KgJ. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.