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OpenVPN: Restart tunnel on resume from Modern Standby #278

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opened 2025年10月28日 10:50:12 +01:00 by rozmansi · 0 comments
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OpenVPN does restart after resume from sleep. However, it does not detect a resume from modern standby. When standby takes long enough for the remote end to close connection, it takes about a minute after resume before OpenVPN detects no traffic and restarts the tunnel.

This situation could be improved using RegisterSuspendResumeNotification and monitor for PBT_APMRESUMEAUTOMATIC messages and doing a SIGUSR1 when standby was long enough.

OpenVPN does restart after resume from sleep. However, it does not detect a resume from modern standby. When standby takes long enough for the remote end to close connection, it takes about a minute after resume before OpenVPN detects no traffic and restarts the tunnel. This situation could be improved using `RegisterSuspendResumeNotification` and monitor for `PBT_APMRESUMEAUTOMATIC` messages and doing a `SIGUSR1` when standby was long enough.
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