Hello,
I have been using a pihole and unbound DNS forever and everything works. Yesterday for the 1st time, I could not log into Prime Video on my Roku. It kept saying Error 0.28. Prime Video did work on all my other devices during this time just not on my Roku's.
Google searching just shows error .28 as a vague network error. Troubleshooting was to disable pihole and then I was able to login to Prime Video on my Roku. I re-enabled pihole blocker and Prime Video works perfectly fine.
I suspect that my cached credentials got lost or expired, on my Roku, and that it was trying to send something from my Roku to Amazon during the authentication process that Pihole didn't like.
I went through the logs to see what pihole was blocking and I did not see anything out of the ordinary. I went thru the logs before when everything was working and after. Everything recorded during my down time, just looked like normal traffic trying to authenticate but ultimately failing. During my down time, the traffic did not look like anything different before and after it was working. I even asked AI to verify my log findings before, during, and after and specifically note if anything was being blocked during the time I was logging in and getting the error .28. AI said nothing was unusual about my logs.
Everything works now, so I can't diagnose anymore. Does anyone have any ideas what to look at the next time it happens?
Source: r/pihole · by /u/kalvick