I cannot add the following RSS feed
https://arielkoren.com/blog/feed/
NNW hang out for 20 seconds and gets

in fact it isn't
Same situation on
https://deniable.org/index.xml (but no 20 seconds timeout)
https://xlab.tencent.com/en/atom.xml
Successfully added to iCloud
FreshRSS logs:
2021-01-24 12:17:45
Unknown error for feed [https://xlab.tencent.com/en/atom.xml]
2021-01-24 12:17:20
Unknown error for feed [https://deniable.org/index.xml]
2021-01-24 12:16:21
Invalid action name for controller FreshRSS_index_Controller
2021-01-24 12:16:12
Invalid action name for controller FreshRSS_index_Controller
2021-01-24 12:16:08
Unknown error for feed [https://arielkoren.com/blog/feed/]
2021-01-24 12:16:03
Invalid action name for controller FreshRSS_subscription_Controller
So, looks like problem on FreshRSS side, but NNW returned that feed was added
Is this a bug related to iCloud or FreshRSS? You seem to reference both.
Is this a bug related to iCloud or FreshRSS? You seem to reference both.
Bug related to FreshRSS, on iCloud all are ok. There no handling FreshRSS errors
https://deniable.org/index.xml has a certificate error. That is probably why you couldn't subscribe to it. We do correctly handle the error returned by FreshRSS.

I'm not having any problems with the other two feeds. You can see them in the screenshot. As mentioned in the FreshRSS issue, please make sure you are using a current version of FreshRSS.
Yes, there only manual adding on FreshRSS without ssl verification (or disabling it)
There was problem w/ certificates on server side, fixed,thanks
Does https://pinkysplanet.net/rss/ parsed correct too?
That one fails for me with an incorrect error. I'll reopen this ticket and investigate.
@dumprop You won't get the already subscribed message anymore (after the next release). You'll instead get a message that states that the feed couldn't be found. The Google Reader API doesn't give us any more information than it didn't work.