diff --git a/cmd/config.go b/cmd/config.go
index 26e77aa..ef50799 100644
--- a/cmd/config.go
+++ b/cmd/config.go
@@ -98,15 +98,16 @@ type RPCEndpointConfig struct { // rpc client-side configuration
 }
 
 type ServerAppConfig  struct {
-	LogMask       []string  `yaml:"log-mask"`
-	LogFile       string    `yaml:"log-file"`
-	LogMaxSize    int64     `yaml:"log-max-size"`
-	LogRotate     int       `yaml:"log-rotate"`
-	MaxPeers      int       `yaml:"max-peer-conns"` // maximum number of connections from peers
-	MaxRpcConns   int       `yaml:"max-rpc-conns"` // maximum number of rpc connections
-	PtyUser       string    `yaml:"pty-user"`
-	PtyShell      string    `yaml:"pty-shell"`
-	XtermHtmlFile string    `yaml:"xterm-html-file"`
+	LogMask         []string  `yaml:"log-mask"`
+	LogFile         string    `yaml:"log-file"`
+	LogMaxSize      int64     `yaml:"log-max-size"`
+	LogRotate       int       `yaml:"log-rotate"`
+	MaxPeers        int       `yaml:"max-peer-conns"` // maximum number of connections from peers
+	MaxRpcConns     int       `yaml:"max-rpc-conns"` // maximum number of rpc connections
+	MinRpcPingIntvl time.Duration  `yaml:"min-rpc-ping-interval"`
+	PtyUser         string    `yaml:"pty-user"`
+	PtyShell        string    `yaml:"pty-shell"`
+	XtermHtmlFile   string    `yaml:"xterm-html-file"`
 }
 
 type ClientAppConfig  struct {
diff --git a/cmd/main.go b/cmd/main.go
index d56aea2..dba9890 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -149,6 +149,7 @@ func server_main(ctl_addrs []string, rpc_addrs []string, rpx_addrs[] string, pxy
 
 	config.CtlPrefix = cfg.CTL.Service.Prefix
 	config.RpcMaxConns = cfg.APP.MaxRpcConns
+	config.RpcMinPingIntvl = cfg.APP.MinRpcPingIntvl
 	config.MaxPeers = cfg.APP.MaxPeers
 
 	pty_user = cfg.APP.PtyUser
diff --git a/server.go b/server.go
index 99c1876..3026d89 100644
--- a/server.go
+++ b/server.go
@@ -23,6 +23,7 @@ import "unsafe"
 import "golang.org/x/net/websocket"
 import "google.golang.org/grpc"
 import "google.golang.org/grpc/credentials"
+import "google.golang.org/grpc/keepalive"
 import "google.golang.org/grpc/peer"
 import "google.golang.org/grpc/stats"
 import "github.com/prometheus/client_golang/prometheus"
@@ -61,6 +62,7 @@ type ServerConfig struct {
 	RpcAddrs []string
 	RpcTls *tls.Config
 	RpcMaxConns int
+	RpcMinPingIntvl time.Duration
 	MaxPeers int
 
 	CtlAddrs []string
@@ -1729,6 +1731,14 @@ func NewServer(ctx context.Context, name string, logger Logger, cfg *ServerConfi
 	s.wpx_addrs = list.New()
 
 	opts = append(opts, grpc.StatsHandler(&ConnCatcher{server: &s}))
+	if s.Cfg.RpcMinPingIntvl > 0 {
+		// https://pkg.go.dev/google.golang.org/grpc/keepalive
+		// grpc library default is 5 minutes if this option is not added.
+		opts = append(opts, grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
+			MinTime: s.Cfg.RpcMinPingIntvl,
+			PermitWithoutStream: true,
+		}))
+	}
 	if s.Cfg.RpcTls != nil { opts = append(opts, grpc.Creds(credentials.NewTLS(s.Cfg.RpcTls))) }
 	//opts = append(opts, grpc.UnaryInterceptor(unaryInterceptor))
 	//opts = append(opts, grpc.StreamInterceptor(streamInterceptor))