Follow the steps that are described on [this answer][1] just instead of using the drop down, type the port (8787) in &quot;port range&quot; an then &quot;Add rule&quot;.



&gt;     Go to the &quot;Network &amp; Security&quot; -&gt; Security Group settings in the left hand navigation
[![enter image description here][2]][2]
&gt;     Find the Security Group that your instance is apart of
&gt;     Click on Inbound Rules
[![enter image description here][3]][3]
&gt;     Use the drop down and add HTTP (port 80)
[![enter image description here][4]][4]
&gt;     Click Apply and enjoy


  [1]: https://stackoverflow.com/a/10454688/298371
  [2]: https://i.stack.imgur.com/H7599.png
  [3]: https://i.stack.imgur.com/j41Q4.png
  [4]: https://i.stack.imgur.com/84YeB.png

You need to open TCP port 8787 in the ec2 Security Group. Also need to open the same port on the EC2 instance&#39;s firewall. 

You need to configure the security group as stated by cyraxjoe.
Along with that you also need to open System port.
Steps to open port in windows :-

 1. On the Start menu, click Run, type WF.msc, and then click OK.
 2. In the Windows Firewall with Advanced Security, in the left pane, right-click Inbound Rules, and then click New Rule in the action pane.
 3. In the Rule Type dialog box, select Port, and then click Next.
 4. In the Protocol and Ports dialog box, select TCP. Select Specific local ports, and then type the port number , such as 8787 for the default instance. Click Next.
 5. In the Action dialog box, select Allow the connection, and then click Next.
 6. In the Profile dialog box, select any profiles that describe the computer connection environment when you want to connect , and then click Next.
 7. In the Name dialog box, type a name and description for this rule, and then click Finish.

Ref:- [Microsoft Docs for port Opening][1]



  [1]: https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/configure-a-windows-firewall-for-database-engine-access?view=sql-server-2017#SSMSProcedure

You just need to run command 

sudo iptables -A INPUT -p tcp --dport &lt;port_number&gt; -j ACCEPT

You will be allow to access port in AWS Ubuntu


I&#39;m using Netbeans to add professional-like comments to each function, I write. So I begin each of it with `/**` and then I press `Enter` to let Netbeans fulfill default comment scheme for following function.

Up until now I&#39;ve been using this only for PHP language and in this case Netbeans was always adding `@returns {type}` part in comment scheme only, if following PHP function really included `return` statement. On so called &quot;procedures&quot; (functions that does not return any value) this part was missing.

Today I tried the same thing for Javascript function and Netbeans added `@returns {undefined}` part to comment scheme even though following function does not return anything.

This confused me. Does Netbeans suggests this way, that every Javascript function has to return anything? What should I do? Ignore (or delete) that comment scheme part or follow suggestion (if this is suggestion at all) and add `return false;` in the end of such function, though it is useless for me?

Does every Javascript function have to return a value?

I&#39;m trying to set up Postgres for the first time, and I need to create a user with permissions to read and create databases. However, when I use:

```
createuser username
```
in my terminal I get the following message: 

&gt; createuser: could not connect to database postgres: FATAL:  role &quot;tom&quot; does not exist

Tom is my Ubuntu user account that I&#39;m logged into right now. I&#39;m trying to create a username of &quot;postgres&quot; then do a `psql -U psql template1` so I can create a database and assign an owner to it for my Rails app. 

Createuser: could not connect to database postgres: FATAL: role &quot;tom&quot; does not exist

I&#39;m running a CherryPy web server at `0.0.0.0:8787` on an EC2 instance. 

I can connect to the web server via local `wget` on the EC2 machine, but I can&#39;t reach the instance from my own remote machine (I connect to EC2 via ssh).

Do I need to open up port 8787 to access the web server remotely? If so, how can this be done?  Also, can I use the public IP of the EC2 instance for this?

How to open a web server port on EC2 instance

I'm running a CherryPy web server at <code>0.0.0.0:8787</code> on an EC2 instance.
I can connect to the web server via local <code>wget</code> on the EC2 machine, but I can't reach the instance from my own remote machine (I connect to EC2 via ssh).
Do I need to open up port 8787 to access the web server remotely? If so, how can this be done? Also, can I use the public IP of the EC2 instance for this?

I&#39;m currently running an ec2 micro instance and i&#39;ve been finding that the instance occasionally runs out of memory.

Other than using a larger instance size, what else can be done?

How do you add swap to an EC2 instance?

So I am having trouble working out what, specifically is the difference between these two.

As I understand it, a snapshot is simply a backup of the disk drive, whereas the AMI is a backup of the entire system (or instance I should say), but isn&#39;t the entire system technically wholly located on the disk drive? and if that&#39;s the case then there is no clear difference and I am missing something?



AWS Difference between a snapshot and AMI

I just installed WordPress 3.5.2 on an Amazon Linux AMI EC2 micro instance. When I tried to install the wp-db-backup plugin (Plugins -&gt; Add New), I was prompted for a Hostname, FTP Username, FTP Password and Connection Type.

The answer to [this question][1] recommended that `passwd` be done at the command line. I&#39;m not clear on exactly what I&#39;m doing at the commandline based on [this answer][2]. So I Googled and found an article on [configuring vsftpd][3]. The article discusses the generation of a certificate on the server and I&#39;m wondering whether I&#39;m going off track here by following this article. I&#39;m using CentOS 6.3 locally, and an Amazon Linux AMI on EC2). 

Any assistance/guidance will be appreciated. Thanks in advance. 


--------------

**EDIT**    

---------------

I was reading the [WordPress Codex][4] which discussed ftp constants for the wp-config.php file. It recommended that I define as few of these constants as needed to correct my update issues. I&#39;m I on the right track here (especially security-wise)? I&#39;ve listed the constants below. Any guidance will be appreciated.

    define(&#39;FS_METHOD&#39;, &#39;ftpext&#39;);
    define(&#39;FTP_BASE&#39;, &#39;/path/to/wordpress/&#39;);
    define(&#39;FTP_CONTENT_DIR&#39;, &#39;/path/to/wordpress/wp-content/&#39;);
    define(&#39;FTP_PLUGIN_DIR &#39;, &#39;/path/to/wordpress/wp-content/plugins/&#39;);
    define(&#39;FTP_PUBKEY&#39;, &#39;/home/username/.ssh/id_rsa.pub&#39;);
    define(&#39;FTP_PRIKEY&#39;, &#39;/home/username/.ssh/id_rsa&#39;);
    define(&#39;FTP_USER&#39;, &#39;username&#39;);
    define(&#39;FTP_PASS&#39;, &#39;password&#39;);
    define(&#39;FTP_HOST&#39;, &#39;ftp.example.org&#39;);
    define(&#39;FTP_SSL&#39;, false);

  [1]: https://stackoverflow.com/questions/8686125/update-wordpress-theme-on-ec2
  [2]: https://stackoverflow.com/questions/8686125/update-wordpress-theme-on-ec2
  [3]: http://wiki.vpslink.com/Configuring_vsftpd_for_secure_connections_%28TLS/SSL/SFTP%29
  [4]: http://codex.wordpress.org/Editing_wp-config.php


WordPress on EC2 Requires FTP Credentials to Install Plugins

I cannot find exact network performance details for different EC2 instance types on Amazon. Instead, they are only saying:

 - High
 - Moderate
 - Low

What does this even mean? I especially want to know the exact amount of `Traffic-OUT` on each instance type.

I need to do live streaming and my stream bit rate will be 240kbps. So I need to know which instance type can handle how many concurrent viewers.

EC2 instance types&#39;s exact network performance?

I want to use my Amazon ec2 instance but faced the following error: 

    Permission denied (publickey).

I have created my key pair and downloaded **.pem** file.


Given:               

    chmod  600 pem file.

Then, this command

    ssh -i /home/kashif/serverkey.pem  ubuntu@ec2-54-227-242-179.compute-1.amazonaws.com

But have this error:

    Permission denied (publickey)

Also, **how can I connect with filezilla to upload/download files?**

       

Permission denied (publickey) when SSH Access to Amazon EC2 instance

I am writing some webservices returning JSON data, which have lots of users.

What are the benefits of using Nginx in front my server compared to just using the go http server?

What are the benefits of using Nginx in front of a webserver for Go?

The web directory is the home of all of your application&#39;s public and static files. Including images, stylesheets and JavaScript files. It is also where the front controllers live.

So the question is when i install and set up xampp my web directory is:

    xampp\htdocs
and I want to set it up for:

    xampp\htdocs\myproject\web

How to do it?
Now when I type in my browser the address: `http://localhost/`  
I enter `xampp\htdocs` directory  
and I want to  type in my browser the address: `http://localhost/`  
and enter `xampp\htdocs\myproject\web` directory


how to configuring a xampp web server for different root directory

I have my instance of the Amazon AWS running, test page is up. 

I am trying to SFTP the files to the server to display my website. I have Filezilla connected to the AWS server but when I try to move the files from my local machine to the /var/www/html directory, it says permission denied.

I just figured out I CAN move the files to the /home/ec2-user directory. So my files are on the server I guess. But when I try to move them from there to the /var/www/html directory, it still won&#39;t move them, permission denied. 

I&#39;ve been researching this for approximately 2 hours now but I haven&#39;t been able to locate the answer to this.


Any help is greatly appreciated, i&#39;m so close! Haha

Thanks


UPDATE

![enter image description here][1]


  [1]: http://i.stack.imgur.com/HZrV9.png

Amazon AWS Filezilla transfer permission denied

I am trying to modify the Nginx config file to remove a &quot;rewrite&quot;.

Currently, I have this config file:

    worker_processes  1;

    events {
        worker_connections  1024;
    }

    http {
        include       mime.types;
        default_type  application/octet-stream;
        sendfile        on;
        keepalive_timeout  65;
    	server {
    		listen      80;
    		server_name amc.local;
    		return 301 https://$host:8443/index.html;
    	}
    }

Now I want to reload this config file, I tried

    nginx -s reload
    nginx -c &lt;conf file&gt;
    nginx -s stop/start


In the log file, there is the line

    2014/01/22 11:25:25 [notice] 1310#0: signal process started

but the modifications are not loaded.


Reload Nginx configuration

What is use of these two directories in Apache&amp;nbsp;2 and how can we do it?


What is the difference between the &#39;sites-enabled&#39; and &#39;sites-available&#39; directory?

Is it possible to have a Docker container access ports opened by the host? Concretely I have  MongoDB and  RabbitMQ running on the host and I&#39;d like to run a process in a Docker container to listen to the queue and (optionally) write to the database. 

I know I can forward a port from the container to the host (via the -p option) and have a connection to the outside world (i.e. internet) from within the Docker container but I&#39;d like to not expose the RabbitMQ and MongoDB ports from the host to the outside world.

EDIT: some clarification:

    Starting Nmap 5.21 ( http://nmap.org ) at 2013-07-22 22:39 CEST
    Nmap scan report for localhost (127.0.0.1)
    Host is up (0.00027s latency).
    PORT     STATE SERVICE
    6311/tcp open  unknown
    
    joelkuiper@vps20528 ~ % docker run -i -t base /bin/bash
    root@f043b4b235a7:/# apt-get install nmap
    root@f043b4b235a7:/# nmap 172.16.42.1 -p 6311 # IP found via docker inspect -&gt; gateway
    
    Starting Nmap 6.00 ( http://nmap.org ) at 2013-07-22 20:43 UTC
    Nmap scan report for 172.16.42.1
    Host is up (0.000060s latency).
    PORT     STATE    SERVICE
    6311/tcp filtered unknown
    MAC Address: E2:69:9C:11:42:65 (Unknown)
    
    Nmap done: 1 IP address (1 host up) scanned in 13.31 seconds

I had to do this trick to get any internet connection withing the container: https://stackoverflow.com/questions/17394241/my-firewall-is-blocking-network-connections-from-the-docker-container-to-outside

**EDIT**: Eventually I went with creating a custom bridge using [pipework](https://github.com/jpetazzo/pipework) and having the services listen on the bridge IP&#39;s. I went with this approach instead of having MongoDB and RabbitMQ listen on the docker bridge because it gives more flexibility. 

Forward host port to docker container

I have installed XAMPP (xampp-win32-1.8.2-0-VC9-installer.exe) on Windows 7 successfully. But unfortunately, the following error was found during running Apache from XAMPP Control Panel: 

    5:38:38 PM  [Apache] 	Error: Apache shutdown unexpectedly.
    5:38:38 PM  [Apache] 	This may be due to a blocked port, missing dependencies, 
    5:38:38 PM  [Apache] 	improper privileges, a crash, or a shutdown by another method.
    5:38:38 PM  [Apache] 	Press the Logs button to view error logs and check
    5:38:38 PM  [Apache] 	the Windows Event Viewer for more clues
    5:38:38 PM  [Apache] 	If you need more help, copy and post this
    5:38:38 PM  [Apache] 	entire log window on the forums

![Error on running Apache at XAMPP Controm Panel][1]


  [1]: http://i.stack.imgur.com/z95JC.png

Apache is not running from XAMPP Control Panel ( Error: Apache shutdown unexpectedly. This may be due to a blocked port)

I have a Node.js/Express.js app running on my server that only works on port 3000 and I&#39;m trying to figure out why. Here&#39;s what I&#39;ve found:

 - Without specifying a port (`app.listen()`), the app runs but the web page does not load.
 - On port 3001 (`app.listen(3001)`) or any other port that is not in use, the app runs but the web page does not load. 
 - On port 2999, the app throws an error because something else is using that port.
 - On port 3000, the app runs and the web page loads fine.

I know that Express apps default to port 3000. But strangely, my app only runs when I explicitly make it run on port 3000 (`app.listen(3000)`).

I found this on line 220 of `/usr/bin/express`:

    app.set(\&#39;port\&#39;, process.env.PORT || 3000);

Which is doing as previously stated: setting the port to what is specified or to 3000 if nothing is specified.

How could I make my app work on a different port such as 8080 or 3001?

Thanks!

**Edit: Code Sample (Very Simple Node/Express App)**

    var express = require(&quot;express&quot;);
    var app = express();

    app.get(&#39;/&#39;, function(req, res){
    	res.send(&#39;hello world&#39;); 
    });

    // Only works on 3000 regardless of what I set environment port to or how I set [value] in app.set(&#39;port&#39;, [value]).
    app.listen(3000);

Node.js/Express.js App Only Works on Port 3000

How to change Apache Tomcat web server default port number?

---
I am developing a web application in JSP, in that for some purpose I need to change tomcat accessing port. Is there any possibility?

How to change Apache Tomcat web server port number

what is `process.env.PORT || 3000` used for in Node.js? I saw this somewhere:

     app.set(&#39;port&#39;, process.env.PORT || 3000);

If it is used to set `3000` as the listening port, can I use this instead?

    app.listen(3000);

If not why?

Content Type	Original Author	Original Content on Stackoverflow
Question	Cat	View Question on Stackoverflow
Solution 1 - Amazon Ec2	cyraxjoe	View Answer on Stackoverflow
Solution 2 - Amazon Ec2	dmohr	View Answer on Stackoverflow
Solution 3 - Amazon Ec2	SurajKj	View Answer on Stackoverflow
Solution 4 - Amazon Ec2	Virendra Yaduvanshi	View Answer on Stackoverflow

How to open a web server port on EC2 instance

Amazon Ec2 Problem Overview

Amazon Ec2 Solutions

Solution 1 - Amazon Ec2

Solution 2 - Amazon Ec2

Solution 3 - Amazon Ec2

Solution 4 - Amazon Ec2

Createuser: could not connect to database postgres: FATAL: role "tom" does not exist

Does every Javascript function have to return a value?

Attributions