port-faq (#166)

* port-faq

* fix wum

docs/manual-EN/1.overview/2.quick-start/2.FAQ.md

@@ -95,12 +95,36 @@ Check the logs (/usr/local/nebula/nebula-storaged.ERROR) of the storaged service
 E1121 04:49:34.563858   256 GraphClient.cpp:54] Thrift rpc call failed: AsyncSocketException: connect failed, type = Socket not open, errno = 111 (Connection refused): Connection refused
 ```
 
-Check service status by
+Check service status by using the following command:
 
 ```bash
 $ /usr/local/nebula/scripts/nebula.service status all
 ```
 
+Or list the hosts:
+
+```ngql
+nebula> SHOW HOSTS;
+```
+
+Please make sure that the following ports are available and not blocked by your firewall. You can find them in the configuration files in `/usr/local/nebula/etc/`.
+
+Service Name|Port
+---|---
+Meta Service|45500, 11000, 11002
+Storage Service|44500, 12000, 12002
+Graph Service|3699, 13000, 13002
+
+Besides, remember to restart the services if you change the default value of the ports.
+
+To check if the ports are available, run the following command:
+
+```bash
+$ telnet $ip $port
+```
+
+Make sure that the port in every host of the cluster is available.
+
 ### Could not create logging file:... Too many open files
 
 1. Check your disk space `df -h`