diff --git a/client/chain/chain.go b/client/chain/chain.go
index e19298fa..0969c3e5 100644
--- a/client/chain/chain.go
+++ b/client/chain/chain.go
@@ -392,6 +392,7 @@ func (c *chainClient) fetchCookie(ctx context.Context) context.Context {
 	c.txClient.GetTx(context.Background(), &txtypes.GetTxRequest{}, grpc.Header(&header))
 	c.setCookie(header)
 	time.Sleep(defaultBlockTime)
+
 	return metadata.NewOutgoingContext(ctx, metadata.Pairs("cookie", c.sessionCookie))
 }
 
@@ -412,6 +413,10 @@ func (c *chainClient) getCookieExpirationTime(cookies []*http.Cookie) (time.Time
 		expiresAt = strings.Replace(cookie.Value, "-", " ", -1)
 	} else {
 		cookie := cookieByName(cookies, "Expires")
+		if cookie == nil {
+			return time.Time{}, nil
+		}
+
 		expiresAt = strings.Replace(cookie.Value, "-", " ", -1)
 		yyyy := fmt.Sprintf("20%s", expiresAt[12:14])
 		expiresAt = expiresAt[:12] + yyyy + expiresAt[14:]
@@ -439,10 +444,12 @@ func (c *chainClient) getCookie(ctx context.Context) context.Context {
 			panic(err)
 		}
 
-		// renew session if timestamp diff < offset
-		timestampDiff := expiresTimestamp.Unix() - time.Now().Unix()
-		if timestampDiff < defaultSessionRenewalOffset {
-			return c.fetchCookie(ctx)
+		if !expiresTimestamp.IsZero() {
+			// renew session if timestamp diff < offset
+			timestampDiff := expiresTimestamp.Unix() - time.Now().Unix()
+			if timestampDiff < defaultSessionRenewalOffset {
+				return c.fetchCookie(ctx)
+			}
 		}
 	} else {
 		return c.fetchCookie(ctx)
diff --git a/client/common/network.go b/client/common/network.go
index e9e0992e..2840d2a7 100644
--- a/client/common/network.go
+++ b/client/common/network.go
@@ -96,7 +96,7 @@ func LoadNetwork(name string, node string) Network {
 			Name:                 "testnet",
 		}
 	case "mainnet":
-		validNodes := []string{"k8s", "lb", "sentry0", "sentry1", "sentry2", "sentry3"}
+		validNodes := []string{"k8s", "lb", "sentry", "sentry0", "sentry1", "sentry2", "sentry3"}
 		if !contains(validNodes, node) {
 			panic(fmt.Sprintf("invalid node %s for %s", node, name))
 		}
@@ -122,6 +122,15 @@ func LoadNetwork(name string, node string) Network {
 			explorerGrpcEndpoint = "tcp://k8s.mainnet.explorer.grpc.injective.network:443"
 			exchangeTlsCert = credentials.NewServerTLSFromCert(&tls.Certificate{})
 			explorerTlsCert = LoadTlsCert(certPath, explorerGrpcEndpoint)
+		} else if node == "sentry" {
+			lcdEndpoint = "https://sentry.lcd.injective.network"
+			tmEndpoint = "http://sentry.tm.injective.network:26657"
+			chainGrpcEndpoint = "sentry.chain.grpc.injective.network:443"
+			exchangeGrpcEndpoint = "sentry.exchange.grpc.injective.network:443"
+			explorerGrpcEndpoint = "k8s.global.mainnet.explorer.grpc.injective.network:443"
+			chainTlsCert = credentials.NewTLS(&tls.Config{InsecureSkipVerify: false})
+			exchangeTlsCert = credentials.NewTLS(&tls.Config{InsecureSkipVerify: false})
+			explorerTlsCert = credentials.NewServerTLSFromCert(&tls.Certificate{})
 		} else {
 			lcdEndpoint = fmt.Sprintf("http://%s.injective.network:10337", node)
 			tmEndpoint = fmt.Sprintf("http://%s.injective.network:26657", node)
@@ -131,7 +140,8 @@ func LoadNetwork(name string, node string) Network {
 			if node == "sentry2" {
 				explorerGrpcEndpoint = "tcp://sentry2.injective.network:9911"
 			} else {
-				explorerGrpcEndpoint = "tcp://api.injective.network:9911"
+				explorerGrpcEndpoint = "k8s.global.mainnet.explorer.grpc.injective.network:443"
+				explorerTlsCert = credentials.NewServerTLSFromCert(&tls.Certificate{})
 			}
 		}
 
diff --git a/examples/exchange/accounts/2_SubaccountBalance/example.go b/examples/exchange/accounts/2_SubaccountBalance/example.go
index 78ebac80..a81e96c2 100644
--- a/examples/exchange/accounts/2_SubaccountBalance/example.go
+++ b/examples/exchange/accounts/2_SubaccountBalance/example.go
@@ -11,7 +11,7 @@ import (
 
 func main() {
 	//network := common.LoadNetwork("mainnet", "k8s")
-	network := common.LoadNetwork("mainnet", "lb")
+	network := common.LoadNetwork("mainnet", "sentry")
 	exchangeClient, err := exchangeclient.NewExchangeClient(network.ExchangeGrpcEndpoint, common.OptionTLSCert(network.ExchangeTlsCert))
 	if err != nil {
 		panic(err)
diff --git a/examples/explorer/1_GetTxByHash/example.go b/examples/explorer/1_GetTxByHash/example.go
index eb03e0b4..833ca12e 100644
--- a/examples/explorer/1_GetTxByHash/example.go
+++ b/examples/explorer/1_GetTxByHash/example.go
@@ -10,7 +10,7 @@ import (
 )
 
 func main() {
-	network := common.LoadNetwork("testnet", "k8s")
+	network := common.LoadNetwork("mainnet", "sentry")
 	explorerClient, err := explorerclient.NewExplorerClient(network.ExplorerGrpcEndpoint, common.OptionTLSCert(network.ExplorerTlsCert))
 	if err != nil {
 		panic(err)