AWS RDS php connection - php

I can't connect to MySQL RDS instance on AWS through php. It gave me this error:
Warning: mysqli::__construct(): (HY000/2002): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. in C:\xampp\htdocs\RESULTS\conne\New Text Document.php on line 7
Connection failed: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
Could you please help me to get through. I am new to AWS and stuff. So I would be much thankful if you could describe this issue in detail.

Is it possible that you do not have the ip address of the server hosting your php application whitelisted under your rds security group? Something like this: https://stackoverflow.com/a/21498471/6763406

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I am trying to connect to a remote mysql server, but I get the
Warning: mysqli_connect(): (HY000/2002): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
This connection worked until a few days back, but I suspect an antivirus update changed the permissions for the port. I am unable to figure it out and it's already frustrating.
I am using XAMPP, which I already reinstalled. I have also tried in WAMP, so it is not local webserver related.
Telnet fails when opening connection to host, my IP is allowed on the remote server.
I have also disabled the antivirus and firewall temporarily, but still fail to connect. What else should I try?
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I'm hosting a php server on localhost using command line on Windows, and I'm trying to establish a connection between it and a Mysql database hosted on my school's servers.
I try to make the connection like so:
$db = mysqli_connect('host', 'username', 'password', 'db_name');
which results in this error:
Warning: mysqli_connect(): (HY000/2002): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
What might be the cause of this error?

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I am making facebook chat api with xmpp. I have downloaded the code from http://developers.facebook.com/docs/chat/
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Test platform connect for XMPP
access_token: <access_token_code>
server: chat.facebook.com
uid: 100002805874899
app id: 434781259869574
[INFO] Opening connection...
Warning: fsockopen() [function.fsockopen]: unable to connect to chat.facebook.com:5222 (A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ) in C:\domains\telecomlijn.nl\wwwroot\wordpress\fbchat.php on line 52
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. (10060)
An error ocurred
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I am using Zend_Rest_Client to connect Zend_Rest_Server, everything seems to be alright, but when I try to get() from the server I recieve this error:
Zend_Http_Client_Adapter_Exception:
Unable to Connect to
tcp://localhost:80. Error #10060: A
connection attempt failed because the
connected party did not properly
respond after a period of time, or
established connection failed because
connected host has failed to respond.
in
C:\www\zf_1_72\library\Zend\Http\Client\Adapter\Socket.php
on line 148
here is code, which I use
$client = new Zend_Rest_Client('http://localhost/my_application/api/index/');
$client->auth($key);
$result = $client->get();
thank's for any advice
This thread suggetss the issue may be with the 'localhost' name - try using 127.0.0.1 instead.

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