{"record":{"id":"9d504d863398438f","repo":"XX-net/XX-Net","slug":"request-address-type-unknown-d-9d504d","errorCode":null,"errorMessage":"request address type unknown:%d","messagePattern":"request address type unknown:(.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"code/default/x_tunnel/local/proxy_handler.py","lineNumber":263,"sourceCode":"            sock.send(b\"\\x05\\x07\\x00\\x01\")  # Command not supported\n            return\n\n        addrtype_pack = data[3:4]\n        addrtype = ord(addrtype_pack)\n        if addrtype == 1:  # IPv4\n            addr_pack = self.read_bytes(4)\n            addr = socket.inet_ntoa(addr_pack)\n        elif addrtype == 3:  # Domain name\n            domain_len_pack = self.read_bytes(1)[0:1]\n            domain_len = ord(domain_len_pack)\n            domain = self.read_bytes(domain_len)\n            addr_pack = domain_len_pack + domain\n            addr = domain\n        elif addrtype == 4:  # IPv6\n            addr_pack = self.read_bytes(16)\n            addr = socket.inet_ntop(socket.AF_INET6, addr_pack)\n        else:\n            xlog.warn(\"request address type unknown:%d\", addrtype)\n            sock.send(b\"\\x05\\x07\\x00\\x01\")  # Command not supported\n            return\n\n        port = struct.unpack('>H', self.rfile.read(2))[0]\n\n        conn_id = proxy_session.create_conn(sock, addr, port)\n        if not conn_id:\n            xlog.warn(\"socks5 create conn to %s:%d fail\", addr, port)\n            reply = b\"\\x05\\x01\\x00\" + addrtype_pack + addr_pack + struct.pack(\">H\", port)\n            sock.send(reply)\n            return\n\n        xlog.info(\"socks5 %r connect to %s:%d conn:%d\", self.client_address, addr, port, conn_id)\n        reply = b\"\\x05\\x00\\x00\" + addrtype_pack + addr_pack + struct.pack(\">H\", port)\n        try:\n            sock.send(reply)\n        except Exception as e:\n            if conn_id in g.session.conn_list:","sourceCodeStart":245,"sourceCodeEnd":281,"githubUrl":"https://github.com/XX-net/XX-Net/blob/cfa5bc17b67676e467f37ec50766127e0ab5f0aa/code/default/x_tunnel/local/proxy_handler.py#L245-L281","documentation":"SOCKS5 request carried an address type other than 1 (IPv4), 3 (domain) or 4 (IPv6); the handler rejects it with reply code 0x07 and closes.","triggerScenarios":"Malformed or exotic SOCKS5 client sending unknown ATYP byte; corrupted greeting stream; or a client speaking a non-SOCKS protocol on the port.","commonSituations":"Broken/misbehaving SOCKS client library, or byte-stream desync after a previous failed negotiation on the same connection.","solutions":["Use a standard-compliant SOCKS5 client","Ensure the client reconnects fresh (no pipelined leftover bytes)","Ignore stray probes"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"if atyp not in (1,3,4): close_connection()","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Use standard SOCKS5 client libraries"],"tags":["x-tunnel","socks5","address-type"],"backgroundTag":"socks-protocol-malformed","analyzedSha":"cfa5bc17b67676e467f37ec50766127e0ab5f0aa","analyzedAt":"2026-08-27T19:28:28.225Z","schemaVersion":2},"datasetVersion":"2026-08-28T00:17:15.603Z"}