TSG's URL-blocking (P19 site) failed to block a second, near-simultaneous TCP session Chrome opens per HTTP request when that session's first-data-packet arrival lagged the SYN by 45+ seconds, because TSG's connection 'opening timeout' parameter defaulted to 10s and expired first, letting the session fall out of tracked state. Fixed in a later release by raising the timeout to 60s.
第二个会话在三次握手后会很长一段时间没有数据传输（45s以上），此时第一个会话被阻断，第二个会话直接从url请求开始，此时出现穿透... 功能端新增opening timeout参数，默认10s...功能端同步将opening timeout参数提升至60s
Defense implications
- Connection-tracking-based blockers have a finite state-timeout window; deliberately delaying first application data past that window (now ~60s+ on patched TSG) can let a connection escape policy evaluation. Verify current timeout values before relying on this — it is a moving, patchable parameter, not a structural weakness.
Related findings
An internal TSG operations/troubleshooting manual lays out TSG's full traffic pipeline (NIC -> mrzcpd/marsio capture driver -> sapp DPI engine -> firewall/proxy(KNI->TFE)/active-defense/WAN-NAT policy branches) and shows engineers using maat_redis_tool to pull the live Redis-synced blocking policy tables (TSG_SECURITY_COMPILE, TSG_OBJ_IP_ADDR, TSG_OBJ_APP_ID) and filter them by numeric policy/object ID to debug why a block rule isn't firing.
A 2023 MESA Lab monthly report describes the 'TF' project's active-defense work: test cases for serial ('串联') HTTP hijack/tamper and parallel ('并联') DNS race-injection ('DNS抢答'), performance tuning that scaled active-defense capacity from 3 to 5 units, converting two existing TSG boxes to active-defense mode, and rewriting the active-defense flow-control logic to no longer depend on sapp.
An 'ADC Hardware Installation and Configuration Guide' (v21.11) describes a modular chassis (Switch Sled, CPU Sled) matching taxonomy's Pakistan/WMS-UTR 'ADC hardware' reference, confirming ADC is a distinct deployed hardware line -- not just a site nickname -- with its own installation documentation separate from the TSG-X/TSG-7400 line.
The Xinjiang Mobile carrier traffic report (2023-05-15) states in its own QUIC-domain-ranking section that Xinjiang's intra-provincial traffic has begun carrying QUIC/HTTP3 (UDP-based) traffic that poses "a huge challenge" to the traditional parallel/out-of-band ("并联") traffic-access blocking method, and that effectively gatekeeping ("GK") UDP/QUIC traffic requires switching to an inline/in-path ("串联") blocking architecture — a direct internal admission that (as of mid-2023, in this province) the standard mirror-tap deployment could not reliably block QUIC.
A thesis-project assignment for hidden-service (VPN/Proxy/Tor) identification via heterogeneous graph neural networks on flow logs sources its one day of training data from a database explicitly named 'tsg_galaxy_p19' — tying the internal TSG naming convention to the taxonomy's P19/WMS-UTR Pakistan site codename — accessed over an internal 'Information Harbor' (信息港) VPN, with ground-truth hidden-service IP labels supplied by the commercial IP-intelligence service spur.us.
At a Pakistan site (P19/MSH), Geedge identified that TCP RST-injection for a Deny action fails on asymmetric ('unidirectional') flows because the synthetic RST packet lacks GRE callid/routing context only present when both directions transit the same node. Two fixes are in progress: a dedicated third-layer packet-injection route, or a cluster-wide coordination mechanism ('SwarmKV') that syncs which policy a session matched across nodes so each node can independently inject its own side's interference packet.