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You are almost certainly hitting this TAP driver issue: https://github.com/OpenVPN/tap-windows6/issues/3 There are two possible solutions: - Downgrade the TAP driver to the old version (the one provided with tinc) - Upgrade the TAP driver to the fixed version which is included in the latest OpenVPN installers at http://openvpn.net/index.php/download/community-downloads.html Note that I did...

Hello tincers, I was recently trying to add a new Windows client to my tinc network and ran into an interesting error; upon starting tinc I am met with the usual successful startup (debug level 0; detects TAP device; Ready), however it appears that any writes/reads from the TAP device fail with: "Error while writing to Windows tap device <device ID truncated>: (997) Overlapped I/O