Message
Out of date: update the app
Out of date: update the app: what the ForestVPN message cp.epoch_unknown means, why it appears and what to do about it.
Updated October 11, 2026
The app says: "Out of date."
What it means
This version of the app cannot check what ForestVPN's service sends.
What to do
Update the app, then connect again.
Why it happens
ForestVPN rotates its signing keys, and this version is older than the current ones.
Where you see it
The ForestVPN apps show this message where the step that failed happened. The code is cp.epoch_unknown.