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2ro
87f82eb61e
The single-target, single-shot probe(1.1.1.1:443) was the read tunnel's
liveness gate AND its keepalive. On a slow/unlucky exit->1.1.1.1 path it
false-declared healthy tunnels DEAD, which rejected freshly-built tunnels and
reselected forever ("Connecting to Nym" for minutes or never) and condemned
working tunnels via keepalive. Now it races two anycast targets (1.1.1.1,
9.9.9.9) over two rounds, mirroring the DoT/DoH resolver racing above it: a
tunnel is DEAD only if it reaches NEITHER across both rounds. Verified over 15
cold starts: 15/15 connected, zero DEAD-EXIT, zero hangs (was the sole cause of
the never-resolves).