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First of all you'd need to make sure that coturn is in the "certgroup" group. Or it won't help.
Secondly, those are just the two files. "certgroup" might still be unable to open them if the directory permissions don't allow opening the directory in the first place. And we can't tell from just the two lines. Make sure all the parent directories also allow traversing to that location. "rX" are required to read and open a directory.
However text files shouldn't have execute permissions. And you've set "rwx" for the group. That doesn't break anything, but "rw-" would be the 100% correct choice there. And other accounts shouldn't have read permissions on the private key. That should be "rw-rw----"
(I'm not sure why you have to do all of that stuff manually... Lot's of frameworks or operating systems come with letsencrypt/certbot and some sane default settings. If your way of doing things doesn't work out, you might want to read a tutorial for your operating system or consider a more standard approach.)
What if I created new directory and copy one of certificate there(manually, using nano), then I gave all permissions to folder and this certificate, but coturn still can't access this cert?
(Same things would apply as I lined out earlier. You'd also need to pay attention to the parent directory of that directory (and maybe parents of those). And check if coturn is actually running as that user and/or group.
You might just (for testing) grant all permissions on the files. Put them into a directory that you're 100% sure coturn can access. Like one of Coturn's own directories. And then chmod 666 both files and give them the same user and group as coturn's own config file has. If that doesn't work, it's not the permissions.)
And read the actual error message again. Make sure it says "permission denied". Make sure the filename in the error message is the exact filename and location of your certificate file. To rule out other errors or a typo.
And now that I'm reading your initial post again, it says it can't find them. So maybe it's really not the permissions, but the coturn config doesn't point to the correct location of the certificate files. Usually permissions is a good first guess. But if the error message says sth else, it could very well be what the error message says. Does it go on and tell you where it looked for the certificates?
ok, I just needed to change owner to turnserver for certs and directories. That's all
Glad you could figure it out. Keep an eye on the certificate updates. As far as I know letsencypt certs are valid for 90 days or so. In case you have a periodic job that renews them, that one might now fail to update the files when it runs the next time in 2 months or so. But that depends on the permissions and user of that renew job. However that's set up. But for the next few months, everything should be fine now.