diff --git a/cache/memcache.go b/cache/memcache.go
index 15d3649c..365c5de7 100644
--- a/cache/memcache.go
+++ b/cache/memcache.go
@@ -21,7 +21,11 @@ func NewMemCache() *MemcacheCache {
 // get value from memcache.
 func (rc *MemcacheCache) Get(key string) interface{} {
 	if rc.c == nil {
-		rc.c = rc.connectInit()
+		var err error
+		rc.c, err = rc.connectInit()
+		if err != nil {
+			return err
+		}
 	}
 	v, err := rc.c.Get(key)
 	if err != nil {
@@ -39,7 +43,11 @@ func (rc *MemcacheCache) Get(key string) interface{} {
 // put value to memcache. only support string.
 func (rc *MemcacheCache) Put(key string, val interface{}, timeout int64) error {
 	if rc.c == nil {
-		rc.c = rc.connectInit()
+		var err error
+		rc.c, err = rc.connectInit()
+		if err != nil {
+			return err
+		}
 	}
 	v, ok := val.(string)
 	if !ok {
@@ -55,7 +63,11 @@ func (rc *MemcacheCache) Put(key string, val interface{}, timeout int64) error {
 // delete value in memcache.
 func (rc *MemcacheCache) Delete(key string) error {
 	if rc.c == nil {
-		rc.c = rc.connectInit()
+		var err error
+		rc.c, err = rc.connectInit()
+		if err != nil {
+			return err
+		}
 	}
 	_, err := rc.c.Delete(key)
 	return err
@@ -76,7 +88,11 @@ func (rc *MemcacheCache) Decr(key string) error {
 // check value exists in memcache.
 func (rc *MemcacheCache) IsExist(key string) bool {
 	if rc.c == nil {
-		rc.c = rc.connectInit()
+		var err error
+		rc.c, err = rc.connectInit()
+		if err != nil {
+			return false
+		}
 	}
 	v, err := rc.c.Get(key)
 	if err != nil {
@@ -93,7 +109,11 @@ func (rc *MemcacheCache) IsExist(key string) bool {
 // clear all cached in memcache.
 func (rc *MemcacheCache) ClearAll() error {
 	if rc.c == nil {
-		rc.c = rc.connectInit()
+		var err error
+		rc.c, err = rc.connectInit()
+		if err != nil {
+			return err
+		}
 	}
 	err := rc.c.FlushAll()
 	return err
@@ -109,20 +129,21 @@ func (rc *MemcacheCache) StartAndGC(config string) error {
 		return errors.New("config has no conn key")
 	}
 	rc.conninfo = cf["conn"]
-	rc.c = rc.connectInit()
-	if rc.c == nil {
+	var err error
+	rc.c, err = rc.connectInit()
+	if err != nil {
 		return errors.New("dial tcp conn error")
 	}
 	return nil
 }
 
 // connect to memcache and keep the connection.
-func (rc *MemcacheCache) connectInit() *memcache.Connection {
+func (rc *MemcacheCache) connectInit() (*memcache.Connection, error) {
 	c, err := memcache.Connect(rc.conninfo)
 	if err != nil {
-		return nil
+		return nil, err
 	}
-	return c
+	return c, nil
 }
 
 func init() {
diff --git a/cache/redis.go b/cache/redis.go
index b923a6df..0fac0deb 100644
--- a/cache/redis.go
+++ b/cache/redis.go
@@ -3,6 +3,7 @@ package cache
 import (
 	"encoding/json"
 	"errors"
+	"io"
 
 	"github.com/beego/redigo/redis"
 )
@@ -33,10 +34,18 @@ func (rc *RedisCache) Get(key string) interface{} {
 			return nil
 		}
 	}
+
 	v, err := rc.c.Do("HGET", rc.key, key)
+	// write to closed socket, reset rc.c to nil
+	if err == io.EOF {
+		rc.c = nil
+		return nil
+	}
+
 	if err != nil {
 		return nil
 	}
+
 	return v
 }
 
@@ -50,7 +59,14 @@ func (rc *RedisCache) Put(key string, val interface{}, timeout int64) error {
 			return err
 		}
 	}
+
 	_, err := rc.c.Do("HSET", rc.key, key, val)
+	// write to closed socket, reset rc.c to nil
+	if err == io.EOF {
+		rc.c = nil
+		return err
+	}
+
 	return err
 }
 
@@ -63,7 +79,14 @@ func (rc *RedisCache) Delete(key string) error {
 			return err
 		}
 	}
+
 	_, err := rc.c.Do("HDEL", rc.key, key)
+	// write to closed socket, reset rc.c to nil
+	if err == io.EOF {
+		rc.c = nil
+		return err
+	}
+
 	return err
 }
 
@@ -76,10 +99,18 @@ func (rc *RedisCache) IsExist(key string) bool {
 			return false
 		}
 	}
+
 	v, err := redis.Bool(rc.c.Do("HEXISTS", rc.key, key))
+	// write to closed socket, reset rc.c to nil
+	if err == io.EOF {
+		rc.c = nil
+		return false
+	}
+
 	if err != nil {
 		return false
 	}
+
 	return v
 }
 
@@ -92,11 +123,14 @@ func (rc *RedisCache) Incr(key string) error {
 			return err
 		}
 	}
+
 	_, err := redis.Bool(rc.c.Do("HINCRBY", rc.key, key, 1))
-	if err != nil {
-		return err
+	// write to closed socket
+	if err == io.EOF {
+		rc.c = nil
 	}
-	return nil
+
+	return err
 }
 
 // decrease counter in redis.
@@ -108,11 +142,15 @@ func (rc *RedisCache) Decr(key string) error {
 			return err
 		}
 	}
+
 	_, err := redis.Bool(rc.c.Do("HINCRBY", rc.key, key, -1))
-	if err != nil {
-		return err
+
+	// write to closed socket
+	if err == io.EOF {
+		rc.c = nil
 	}
-	return nil
+
+	return err
 }
 
 // clean all cache in redis. delete this redis collection.
@@ -124,7 +162,13 @@ func (rc *RedisCache) ClearAll() error {
 			return err
 		}
 	}
+
 	_, err := rc.c.Do("DEL", rc.key)
+	// write to closed socket
+	if err == io.EOF {
+		rc.c = nil
+	}
+
 	return err
 }