S3 Gateway: Handle restricted access credentials (#7757)

cmd/gateway-main.go

@@ -148,6 +148,9 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 
 	initNSLock(false) // Enable local namespace lock.
 
+	// Set when gateway is enabled
+	globalIsGateway = true
+
 	router := mux.NewRouter().SkipClean(true)
 
 	if globalEtcdClient != nil {
@@ -304,9 +307,6 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 		printGatewayStartupMessage(getAPIEndpoints(), gatewayName)
 	}
 
-	// Set when gateway is enabled
-	globalIsGateway = true
-
 	// Set uptime time after object layer has initialized.
 	globalBootTime = UTCNow()