diff --git a/pkg/innerring/innerring.go b/pkg/innerring/innerring.go
index c57cbe6f..1a829023 100644
--- a/pkg/innerring/innerring.go
+++ b/pkg/innerring/innerring.go
@@ -235,6 +235,13 @@ func (s *Server) Stop() {
 	}
 }
 
+func (s *Server) registerNoErrCloser(c func()) {
+	s.registerCloser(func() error {
+		c()
+		return nil
+	})
+}
+
 func (s *Server) registerIOCloser(c io.Closer) {
 	s.registerCloser(c.Close)
 }
@@ -393,6 +400,8 @@ func New(ctx context.Context, log *zap.Logger, cfg *viper.Viper) (*Server, error
 		RangeTimeout: cfg.GetDuration("audit.timeout.rangehash"),
 	})
 
+	server.registerNoErrCloser(clientCache.cache.CloseAll)
+
 	pdpPoolSize := cfg.GetInt("audit.pdp.pairs_pool_size")
 	porPoolSize := cfg.GetInt("audit.por.pool_size")
 
diff --git a/pkg/innerring/rpc.go b/pkg/innerring/rpc.go
index 45130612..3d812d2d 100644
--- a/pkg/innerring/rpc.go
+++ b/pkg/innerring/rpc.go
@@ -23,6 +23,7 @@ type (
 		log   *zap.Logger
 		cache interface {
 			Get(address *network.Address) (client.Client, error)
+			CloseAll()
 		}
 		key *ecdsa.PrivateKey