Weird "Unkown Error" message at specific times i get this weird "Unknown error" message sometime every 56th minute of every hour. The error looks like this:


Screenshot (click to enlarge)

It used to pop at every 26th minute but recently moved to every 56th. Anyone got any ideas as to what this may be?
This is definitely an app installed on the phone, that has a 1 hour sync interval which fails to connect to its designated server. The sync will land on the same minute of every hour.

Things to try:


Find a connected account with a 1 hour sync interval set, by going to Settings -&gt; Account &amp; Sync. Remove or update the culprit through Play Store.
If you have DroidWall or AFWall on a rooted device, the culprit app might be blocked in the iptables rules.
Try connecting to a different network, the network you're currently on may have a firewall blocking the culprit app. If you're on cellular data (no WiFi), still try this, your provider may have a screwed up DNS record for the culprit site.
Update every app on your phone through Google Play Store, especially if you're on Marshmallow.
If all the above fails, disable one app at a time until you find the culprit. You may not be able to disable updated apps, only uninstall them. You will have to use pm disable com.example.application from ADB or a terminal emulator. When you find the app, uninstall it, or contact the developer for an update.


If you're rooted and have Xposed framework:


There are two Xposed mods that will tell you directly what app the error is originating from:


Buttered Toast - Xposed Repo: Adds the Application name to any Toast notification displayed.
Burnt Toast: Inspired by Buttered Toast, Burnt Toast shows the application icon in a Toast message. Screenshot:





I wouldn't recommend Burnt Toast in this case because not all apps have distinct icons, but it is more UI-friendly.

Hope this helps