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appolimp
5f81ae3743
TCP keepalive was configured (SetKeepAlivePeriod) but never actually enabled (SO_KEEPALIVE) on accepted client connections. Go 1.26's SetKeepAlivePeriod only sets TCP_KEEPIDLE — it does not call setsockopt(SO_KEEPALIVE, 1). Without SO_KEEPALIVE the kernel never sends probe packets, so dead connections from sleeping mobile clients linger until the idle timeout fires. Replace SetKeepAlive + SetKeepAlivePeriod with net.KeepAliveConfig (available since Go 1.24) for explicit per-socket control: Idle: 30s (time before first probe) Interval: 10s (between probes) Count: 3 (failed probes to declare dead) This detects dead connections in ~60s instead of relying on system defaults (tcp_keepalive_intvl=75s, probes=9 → up to 11 minutes). Increase the default idle timeout from 1 minute to 5 minutes. MTProto clients send ping_delay_disconnect every ~60s, which resets the idle timer. The previous 1-minute default created a race: if a ping arrived even 1–2 seconds late the relay was killed. A 5-minute window also survives typical mobile sleep periods (phone idle 2–5 min) where the NAT mapping is still alive and the connection can resume without reconnection. Ref: #132