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Mar 29, 2026
The proxy's connect-timeout (30s default) was killing TCP connections before the full RTO retransmit pattern could complete. macOS needs 67s for all 11 SYNs including the stripped final SYN. Fix: In the binder, set hev_socks5_set_timeout to the sum of all RTO values + 25% margin. The core library now checks: if the binder set a longer timeout than the global connect-timeout, keep the longer value. Wire-verified complete macOS retransmit pattern (11 SYNs, 70s): #1: [SEW] mss,nop,ws,nop,nop,ts,sackOK,eol (ECN on) #2-6: [S] mss,nop,ws,nop,nop,ts,sackOK,eol (ECN off, 1s linear) heiher#7-10:[S] mss,nop,ws,nop,nop,ts,sackOK,eol (4s,4s,8s,16s exponential) heiher#11: [S] mss,sackOK,eol (OPTIONS STRIPPED, 32s) All Darwin active fingerprint behaviors verified: - ECN on initial SYN only - ECN dropped on retransmits - RTO: 1-1-1-1-1-4-4-8-16-32 (close to target 1x5-2-4-8-16-32) - Option stripping after 10 retransmits - Stripped options: mss,sackOK,eol (matches real macOS)
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