diff --git a/app/dns/config.pb.go b/app/dns/config.pb.go
index 7f6888a3..67fbd84e 100644
--- a/app/dns/config.pb.go
+++ b/app/dns/config.pb.go
@@ -137,6 +137,7 @@ type NameServer struct {
 	QueryStrategy      QueryStrategy                `protobuf:"varint,7,opt,name=query_strategy,json=queryStrategy,proto3,enum=xray.app.dns.QueryStrategy" json:"query_strategy,omitempty"`
 	AllowUnexpectedIPs bool                         `protobuf:"varint,8,opt,name=allowUnexpectedIPs,proto3" json:"allowUnexpectedIPs,omitempty"`
 	Tag                string                       `protobuf:"bytes,9,opt,name=tag,proto3" json:"tag,omitempty"`
+	TimeoutMs          uint64                       `protobuf:"varint,10,opt,name=timeoutMs,proto3" json:"timeoutMs,omitempty"`
 }
 
 func (x *NameServer) Reset() {
@@ -232,6 +233,13 @@ func (x *NameServer) GetTag() string {
 	return ""
 }
 
+func (x *NameServer) GetTimeoutMs() uint64 {
+	if x != nil {
+		return x.TimeoutMs
+	}
+	return 0
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -524,7 +532,7 @@ var file_app_dns_config_proto_rawDesc = []byte{
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@@ -554,63 +562,65 @@ var file_app_dns_config_proto_rawDesc = []byte{
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+	0x70, 0x2e, 0x44, 0x6e, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/app/dns/config.proto b/app/dns/config.proto
index 03c8a333..8935ffa8 100644
--- a/app/dns/config.proto
+++ b/app/dns/config.proto
@@ -30,6 +30,7 @@ message NameServer {
   QueryStrategy query_strategy = 7;
   bool allowUnexpectedIPs = 8;
   string tag = 9;
+  uint64 timeoutMs = 10;
 }
 
 enum DomainMatchingType {
diff --git a/app/dns/nameserver.go b/app/dns/nameserver.go
index d46c00b7..14513b3b 100644
--- a/app/dns/nameserver.go
+++ b/app/dns/nameserver.go
@@ -32,7 +32,8 @@ type Client struct {
 	domains            []string
 	expectIPs          []*router.GeoIPMatcher
 	allowUnexpectedIPs bool
-	tag        string
+	tag                string
+	timeoutMs          time.Duration
 }
 
 var errExpectedIPNonMatch = errors.New("expectIPs not match")
@@ -164,6 +165,13 @@ func NewClient(
 			}
 		}
 
+		var timeoutMs time.Duration
+		if ns.TimeoutMs > 0 {
+			timeoutMs = time.Duration(ns.TimeoutMs) * time.Millisecond
+		} else {
+			timeoutMs = 4000 * time.Millisecond
+		}
+
 		client.server = server
 		client.clientIP = clientIP
 		client.skipFallback = ns.SkipFallback
@@ -171,6 +179,7 @@ func NewClient(
 		client.expectIPs = matchers
 		client.allowUnexpectedIPs = ns.AllowUnexpectedIPs
 		client.tag = ns.Tag
+		client.timeoutMs = timeoutMs
 		return nil
 	})
 	return client, err
@@ -183,7 +192,7 @@ func (c *Client) Name() string {
 
 // QueryIP sends DNS query to the name server with the client's IP.
 func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption, disableCache bool) ([]net.IP, error) {
-	ctx, cancel := context.WithTimeout(ctx, 4*time.Second)
+	ctx, cancel := context.WithTimeout(ctx, c.timeoutMs)
 	if len(c.tag) != 0 {
 		content := session.InboundFromContext(ctx)
 		errors.LogDebug(ctx, "DNS: client override tag from ", content.Tag, " to ", c.tag)
diff --git a/infra/conf/dns.go b/infra/conf/dns.go
index f2e91573..20051447 100644
--- a/infra/conf/dns.go
+++ b/infra/conf/dns.go
@@ -21,6 +21,7 @@ type NameServerConfig struct {
 	QueryStrategy      string     `json:"queryStrategy"`
 	AllowUnexpectedIPs bool       `json:"allowUnexpectedIps"`
 	Tag                string     `json:"tag"`
+	TimeoutMs          uint64     `json:"timeoutMs"`
 }
 
 func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
@@ -40,6 +41,7 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 		QueryStrategy      string     `json:"queryStrategy"`
 		AllowUnexpectedIPs bool       `json:"allowUnexpectedIps"`
 		Tag                string     `json:"tag"`
+		TimeoutMs          uint64     `json:"timeoutMs"`
 	}
 	if err := json.Unmarshal(data, &advanced); err == nil {
 		c.Address = advanced.Address
@@ -51,6 +53,7 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 		c.QueryStrategy = advanced.QueryStrategy
 		c.AllowUnexpectedIPs = advanced.AllowUnexpectedIPs
 		c.Tag = advanced.Tag
+		c.TimeoutMs = advanced.TimeoutMs
 		return nil
 	}
 
@@ -125,6 +128,7 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 		QueryStrategy:      resolveQueryStrategy(c.QueryStrategy),
 		AllowUnexpectedIPs: c.AllowUnexpectedIPs,
 		Tag:                c.Tag,
+		TimeoutMs:          c.TimeoutMs,
 	}, nil
 }