I get the error message in the title for series that not running right now, for e.x. game of thones. Other series seem to work fine. From the trace it looks like sonar is trying to access this web address:
Does that same address work in Edge and IE11?
Skyhook is behind CloudFlare, we’ve seen issues with people on VPNs/shared IPs being unable to connect at times, but generally it’s temporary and affects everything at once.
I attached another trace where I refreshed one series that does not work and then another one that does not. I tried to open the links in IE and Edge and they just open fine. I have no idea why it would not work in sonarr.