diff --git a/src/middleware/auth.js b/src/middleware/auth.js
index b89586a4..b18b5322 100644
--- a/src/middleware/auth.js
+++ b/src/middleware/auth.js
@@ -7,6 +7,57 @@ const redis = require('../models/redis')
 // const { RateLimiterRedis } = require('rate-limiter-flexible') // 暂时未使用
 const ClientValidator = require('../validators/clientValidator')
 
+const FALLBACK_CONCURRENCY_CONFIG = {
+  leaseSeconds: 300,
+  renewIntervalSeconds: 30,
+  cleanupGraceSeconds: 30
+}
+
+const resolveConcurrencyConfig = () => {
+  if (typeof redis._getConcurrencyConfig === 'function') {
+    return redis._getConcurrencyConfig()
+  }
+
+  const raw = {
+    ...FALLBACK_CONCURRENCY_CONFIG,
+    ...(config.concurrency || {})
+  }
+
+  const toNumber = (value, fallback) => {
+    const parsed = Number(value)
+    if (!Number.isFinite(parsed)) {
+      return fallback
+    }
+    return parsed
+  }
+
+  const leaseSeconds = Math.max(
+    toNumber(raw.leaseSeconds, FALLBACK_CONCURRENCY_CONFIG.leaseSeconds),
+    30
+  )
+
+  let renewIntervalSeconds
+  if (raw.renewIntervalSeconds === 0 || raw.renewIntervalSeconds === '0') {
+    renewIntervalSeconds = 0
+  } else {
+    renewIntervalSeconds = Math.max(
+      toNumber(raw.renewIntervalSeconds, FALLBACK_CONCURRENCY_CONFIG.renewIntervalSeconds),
+      0
+    )
+  }
+
+  const cleanupGraceSeconds = Math.max(
+    toNumber(raw.cleanupGraceSeconds, FALLBACK_CONCURRENCY_CONFIG.cleanupGraceSeconds),
+    0
+  )
+
+  return {
+    leaseSeconds,
+    renewIntervalSeconds,
+    cleanupGraceSeconds
+  }
+}
+
 const TOKEN_COUNT_PATHS = new Set([
   '/v1/messages/count_tokens',
   '/api/v1/messages/count_tokens',
@@ -116,13 +167,10 @@ const authenticateApiKey = async (req, res, next) => {
     // 检查并发限制
     const concurrencyLimit = validation.keyData.concurrencyLimit || 0
     if (!skipKeyRestrictions && concurrencyLimit > 0) {
-      const concurrencyConfig = config.concurrency || {}
-      const leaseSeconds = Math.max(concurrencyConfig.leaseSeconds || 900, 30)
-      const rawRenewInterval =
-        typeof concurrencyConfig.renewIntervalSeconds === 'number'
-          ? concurrencyConfig.renewIntervalSeconds
-          : 60
-      let renewIntervalSeconds = rawRenewInterval
+      const { leaseSeconds: configLeaseSeconds, renewIntervalSeconds: configRenewIntervalSeconds } =
+        resolveConcurrencyConfig()
+      const leaseSeconds = Math.max(Number(configLeaseSeconds) || 300, 30)
+      let renewIntervalSeconds = configRenewIntervalSeconds
       if (renewIntervalSeconds > 0) {
         const maxSafeRenew = Math.max(leaseSeconds - 5, 15)
         renewIntervalSeconds = Math.min(Math.max(renewIntervalSeconds, 15), maxSafeRenew)
@@ -215,6 +263,29 @@ const authenticateApiKey = async (req, res, next) => {
         decrementConcurrency()
       })
 
+      req.once('aborted', () => {
+        logger.warn(
+          `⚠️ Request aborted for key: ${validation.keyData.id} (${validation.keyData.name})`
+        )
+        decrementConcurrency()
+      })
+
+      req.once('error', (error) => {
+        logger.error(
+          `❌ Request error for key ${validation.keyData.id} (${validation.keyData.name}):`,
+          error
+        )
+        decrementConcurrency()
+      })
+
+      res.once('error', (error) => {
+        logger.error(
+          `❌ Response error for key ${validation.keyData.id} (${validation.keyData.name}):`,
+          error
+        )
+        decrementConcurrency()
+      })
+
       // res.on('finish') 处理正常完成的情况
       res.once('finish', () => {
         logger.api(
diff --git a/src/models/redis.js b/src/models/redis.js
index e4c27243..ea917c28 100644
--- a/src/models/redis.js
+++ b/src/models/redis.js
@@ -1575,13 +1575,53 @@ class RedisClient {
   // 获取并发配置
   _getConcurrencyConfig() {
     const defaults = {
-      leaseSeconds: 900,
+      leaseSeconds: 300,
+      renewIntervalSeconds: 30,
       cleanupGraceSeconds: 30
     }
-    return {
+
+    const configValues = {
       ...defaults,
       ...(config.concurrency || {})
     }
+
+    const normalizeNumber = (value, fallback, options = {}) => {
+      const parsed = Number(value)
+      if (!Number.isFinite(parsed)) {
+        return fallback
+      }
+
+      if (options.allowZero && parsed === 0) {
+        return 0
+      }
+
+      if (options.min !== undefined && parsed < options.min) {
+        return options.min
+      }
+
+      return parsed
+    }
+
+    return {
+      leaseSeconds: normalizeNumber(configValues.leaseSeconds, defaults.leaseSeconds, {
+        min: 30
+      }),
+      renewIntervalSeconds: normalizeNumber(
+        configValues.renewIntervalSeconds,
+        defaults.renewIntervalSeconds,
+        {
+          allowZero: true,
+          min: 0
+        }
+      ),
+      cleanupGraceSeconds: normalizeNumber(
+        configValues.cleanupGraceSeconds,
+        defaults.cleanupGraceSeconds,
+        {
+          min: 0
+        }
+      )
+    }
   }
 
   // 增加并发计数（基于租约的有序集合）
@@ -1650,10 +1690,10 @@ class RedisClient {
         local now = tonumber(ARGV[3])
         local ttl = tonumber(ARGV[4])
 
-        local exists = redis.call('ZSCORE', key, member)
-
         redis.call('ZREMRANGEBYSCORE', key, '-inf', now)
 
+        local exists = redis.call('ZSCORE', key, member)
+
         if exists then
           redis.call('ZADD', key, expireAt, member)
           if ttl > 0 then