ping balancer 无法消除部分节点的异常
@zonyitoo 大佬，您好：
我目前正在使用 ss-rust 的 ping balancer 功能进行节点选优，但客户端日志显示其中一个节点的 TCP 协议一直报一个警告，而此节点的 UDP 日志是一切正常的。而且此服务器的 ssserver 日志也无报错。
此外我也测试了服务器与检测地址的连通性，均正常：
```sh
root@TYO ~/docker-compose/net/shadowsocks-rust # curl http://detectportal.firefox.com/success.txt -4
success
root@TYO ~/docker-compose/net/shadowsocks-rust # curl http://detectportal.firefox.com/success.txt -6
success
```
我的总共5个服务端节点，配置完全一样的，就只有其中一个节点出现这种问题，感觉是 ping balancer 存在 bug，这应该如何排查呢？
---
客户端日志如下：
```sh
root@OpenWrt:~/docker-compose/net/shadowsocks-rust # docker logs sslocal 2>&1 | grep -E '10.4.2.1|4x.xx.xx.xx' | grep TCP
2026-01-31T20:09:50.539373881+08:00 DEBUG tokio-runtime-worker ThreadId(05) shadowsocks_service::local::loadbalancing::ping_balancer: failed to check TCP server 4x.xx.xx.xx:1776, error: unexpected response from http://detectportal.firefox.com/success.txt, b""
2026-01-31T20:09:50.539469964+08:00 WARN tokio-runtime-worker ThreadId(05) shadowsocks_service::local::loadbalancing::ping_balancer: balancer: checked & updated remote TCP server 4x.xx.xx.xx:1776 (score: 11764), ServerStatData { latency_median: 10000, fail_rate: 1.0, latency_stdev: 7071.067811865475, latency_mean: 10000.0, latency_mad: 10000 }
2026-01-31T20:09:59.388044441+08:00 WARN tokio-runtime-worker ThreadId(04) shadowsocks_service::local::loadbalancing::ping_balancer: balancer: checked & updated remote TCP server 10.4.2.1:1776 (score: 10000), ServerStatData { latency_median: 10000, fail_rate: 1.0, latency_stdev: 7071.067811865475, latency_mean: 10000.0, latency_mad: 10000 }
2026-01-31T20:10:24.399919328+08:00 WARN tokio-runtime-worker ThreadId(02) shadowsocks_service::local::loadbalancing::ping_balancer: balancer: checked & updated remote TCP server 4x.xx.xx.xx:1776 (score: 11764), ServerStatData { latency_median: 10000, fail_rate: 1.0, latency_stdev: 7071.067811865475, latency_mean: 10000.0, latency_mad: 10000 }
2026-01-31T20:10:24.400692784+08:00 WARN tokio-runtime-worker ThreadId(02) shadowsocks_service::local::loadbalancing::ping_balancer: balancer: checked & updated remote TCP server 10.4.2.1:1776 (score: 10000), ServerStatData { latency_median: 10000, fail_rate: 1.0, latency_stdev: 7071.067811865475, latency_mean: 10000.0, latency_mad: 10000 }
```
服务端配置如下（其余节点配置完全相同）：
```json
root@TYO ~/docker-compose/net/shadowsocks-rust # cat shadowsocks-rust-data/server.json
{
"servers": [
{
"server": "::",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD_1}",
"method": "2022-blake3-aes-128-gcm"
},
{
"server": "::",
"server_port": 1984,
"password": "${SHADOWSOCKS_PASSWORD_2}",
"method": "2022-blake3-chacha8-poly1305"
},
{
"server": "::",
"server_port": 2047,
"password": "${SHADOWSOCKS_PASSWORD_3}",
"method": "aes-128-gcm"
}
],
"mode": "tcp_and_udp",
"timeout": 600,
"udp_timeout": 300,
"keep_alive": 300,
"nofile": 1048576,
"no_delay": true,
"fast_open": true,
"mptcp": true
}
```
客户端配置如下：
```json
root@OpenWrt:~/docker-compose/net/shadowsocks-rust # cat shadowsocks-rust-data/local.json
{
"locals": [
{
"local_address": "127.0.0.1",
"local_port": 1234,
"protocol": "redir",
"tcp_redir": "tproxy",
"udp_redir": "tproxy"
},
{
"local_address": "::1",
"local_port": 1234,
"protocol": "redir",
"tcp_redir": "tproxy",
"udp_redir": "tproxy"
}
],
"servers": [
//
// DIRECT [TCP + UDP]
//
{
// CN2
"server": "1x.xx.xx.xx",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm",
"tcp_weight": 0.85,
"udp_weight": 0.85
},
{
// LAX
"server": "2x.xx.xx.xx",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm",
"tcp_weight": 0.85,
"udp_weight": 0.85
},
{
// CC
"server": "3x.xx.xx.xx",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm",
"tcp_weight": 0.85,
"udp_weight": 0.85
},
{
// TYO
"server": "4x.xx.xx.xx",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm",
"tcp_weight": 0.85,
"udp_weight": 0.85
},
{
// TW
"server": "5x.xx.xx.xx",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm",
"tcp_weight": 0.85,
"udp_weight": 0.85
},
//
// TINYFECVPN [TCP + UDP]
//
{
// CN2
"server": "10.1.1.1",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm"
},
{
// LAX
"server": "10.2.1.1",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm"
},
{
// CC
"server": "10.3.1.1",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm"
},
{
// TYO-GAME
"server": "10.4.2.1",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm"
},
{
// TW
"server": "10.5.1.1",
"server_port": 1776,
"password": "${SHADOWSOCKS_PASSWORD}",
"method": "2022-blake3-aes-128-gcm"
},
],
"mode": "tcp_and_udp",
"timeout": 600,
"udp_timeout": 300,
"keep_alive": 300,
"nofile": 1048576,
"no_delay": true,
"fast_open": true,
"mptcp": true,
"balancer": {
"max_server_rtt": 5,
"check_interval": 30,
"check_best_interval": 15
}
}
```
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