I've stored a web project (PHP, HTML and CSS). I'm working inside opt/lampp/htdocs XAMPP directory, so I can run the .php files using the web browser. One of those .php files tries to connect to an external server MySQL database, but, when run:
mysqli_connect($servername, $username, $userpassword);
it displays the following warning.
*mysqli_connect(): (HY000/2002): Connection refused*
I've tried to access the database with phpmyadmin and the corresponding credentials and it works fine.
So the question is: can I perform a msqli_connect to that external database using XAMPP or I should give up?
Thanks in advance!
Since I cannot comment because of my low points, I am answering here.
I had faced similar issues before, so sharing my experience. All of the comments have suggested valuable points. These are as follows:
Use IP address instead of server name (There may be some DNS cache issue, so it is safe to use IP address).
Make sure the IP address you are using is not being blocked by the server's firewall. If possible configure server's firewall to white-list your IP Address.
The default MySQL port is 3306. Make sure the firewall is configured for allowing outside connection to the port 3306.
Most importantly, make sure the MySQL server must be configured to accept connections externally. If all of the above settings are configured properly then you should grant external access and all privilege to your MySQL User.
GRANT ALL PRIVILEGES ON 'yourDatabase'.* TO 'yourUserName'#'%';
FLUSH PRIVILEGES;
Reference - Another SO Question.
Related
I try running a php script on a external server and hosting. I selected byethost because it's a free service. All my system run excellent, except this script. I search information and i not found anything.
exec('mysqldump -u useronserver -ppasswordonserver clinicasbv >' . RESPALDOS_DB_L . date('Y_m_d_g_i_s', time() - (21600 - 3600)) . '_clinicasbv_backup.sql');
This code working perfect on my virtual host in my machine, but not work in byethost.
So, i need a root privileges or anything for running this script in a
external server? I need this script working on a external server, it's all
It is very likely that the hosting provider has blocked your ability to run the "exec()" function. It is technically a security risk to allow it. You should find another way to get the MySQL dump, i.e. connecting remotely using a MySQL system or using the PHP MySQLi functions.
To do this, the connecting host will preferably need a static IP address otherwise you'll need to re-do this guide each time their dynamic IP address from their ISP changes.
You can allow access from cPanel for MySQL itself. We'll also need to setup an allow rule through the firewall which is covered here.
Login to your cPanel.
Go to Databases ยป Remote MySQL.
Enter the IP address of the computer that will be making the remote connection.
Click the Add Host button.
Now we need to allow the person's IP to be able to connect to port 3306 which is closed by default. The best way to do this is with a firewall rule specific to their IP and port 3306 and how to do this for CSF is detailed here.
I want to connect to a remote database from my localhost, but the remote DB only allows connections from whitelisted IPs.
Since I'm on a dynamic IP from my ISP, I can't have my home IP whitelisted, because it will just change again.
I have a VPS with full root access and a fixed IP, which is whitelisted.
What I want is to:
Run a php script from my local machine
Connect to the remote database via my VPS
Get the query results back to my local machine for handling
How do I do this?
Having a PHP proxy to execute arbitrary SQL statements from any IP address is really dangerous. I would suggest you abstract the SQL statements into an API, so rather than allowing any query through, you limit it to a specific set of queries to retrieve or update specific data. Your local machine could then just call that API to retrieve or update information.
The key problem you need to solve is finding a host with a static IP address you can add to the whitelist. You say that you have already solved that problem. However you have not mentioned what OS is running on the vps nor the client. If both are Linux, then you can do this with just iptables. If either or both are mswindows then you could use socat, but if it were me, I'd go with a stunnel link between the client and proxy (although if the whitelist on the server is only applied to the mysql connection, you could terminate the stunnel connection on the server and skip the proxy altogether) using client certificate authentication or an SSH tunnel.
I have a WordPress website, which is not done by me, all I need to do is connect to its database remotely and query some results from its database. The point is that I don't know anything about WordPress, and I saw that the database information are written inside the wp-config.php file, when I opened it, there was the username and password, but the host name was this:
define('DB_HOST', 'localhost');
Which seems a bit curious to me. The website uses cPanel X from GoDaddy, and when I logged in there and opened phpMyAdmin, it had these information under database server part:
Server: Localhost via UNIX socket
So, I really don't know how to remotely connect to the database and query things, because host name says localhost. I'm used to ASP.NET MVC, and where I specify the host name to be the actual server ip or hostname of the database server. Any idea how should I proceed?
This is probably a better question for superuser as it's technically a hosting related question. That being said, you would need to contact GoDaddy and find out if they even allow remote MySQL connections on their servers. Most hosting companies disable external connections to the MySQL server on port 3306, but if you portscan your domain name/IP and see 3306 open then you can probably remote connect to it. Just use the domain name/IP of your site as the host, and pull the user/pass/db name from the config file.
You can do this by using command line.
GRANT ALL ON wpdb.* TO wpuser#`192.168.2.25` IDENTIFIED BY `Pa55w0rd!`;
Check here for a detailed tutorial.
I have set up my wordpress site on my local machine and I would like it to talk to the live mysql database on the server. I accessed the wp-config.php file on my machine and changed the hostname to use the ip address instead of localhost, but it will not work.
What do I need to do?
It could be that your remote database is configured to accept connections only from localhost for security reasons. Most web providers set it up that way. In that case, you have no chance of making this work.
Anyway, even if you would get it to work, you will encounter two problems: It will be awfully slow, and the HTML served by the remote database will contain references to server URLs (as opposed to local ones).
If you need more detailed information, you will need to post any error messages you get from mySQL.
Alternatively, you can try running the mysql command-line utility to connect.
mysql -u username -h server -p wordpress_database
Make sure that works first before attempting to get Wordpress to connect.
My guess is you won't be able to connect due to firewall issues. MySql uses port 3306 by default, so if the server's firewall doesn't allow connections through that port, you'll either have to change the port mysql is using (probably a bad idea if other apps expect to see MySql on that port) or get that port opened on the server (make sure you only open it for local IPs, so someone else can't get to your MySql instance!)
I'm working with my University's Systems Administrators to get a LAMP stack setup for me. I'll need to access this server from several websites that I'm working on and I'm having some issues.
So to keep thing's clear:
LAMP Server URL = https://mysqlserver.edu
School URL = https://schoolsite.edu
When I run mysql_connect() on the LAMP Server it connects fine:
mysql_connect('localhost', 'user', 'password'); Works great!
However, when I run mysql_connect() on the School URL I can't connect:
mysql_connect('mysqlserver.edu', 'user', 'password');
Warning: mysql_connect(): Unknown MySQL server host 'mysqlserver.edu' (1) in /home/content/x/x/x/xxx/html/testconnect.php on line 3
Unknown MySQL server host 'mysqlserver.edu' (1)
What do I need to ask the System Administrator to do in order to give my PHP scripts on external sites access to the MySQL server?
Does the SSL complicate issues?
I appreciate any insight you might be able to provide.
Unknown MySQL server host probably means that your machine cannot resolve to hostname mysqlserver.edu, have you tried connecting via IP address?
After you make sure you are resolving the name, you have to overcome three further barriers:
firewalls as others have shown,
MySQL server configuration which has to allow remote connections and
a user able to connect remotely has to be setup.
MySQL user depends on the computer it is access from. 'root#localhost' is not the same root as 'root#192.168.0.156'. So you have to add the user from the computer you are going to access from. So let say the computer where php script is served is '192.168.156' you need to add a user 'user#192.168.0.156' to the MySQL server and don't forget to set the privilege for that user to access to the database needed.
Hope this helps
It's rare to make a MySQL connection over a public WAN. It's common to take a LAN hop or two but you usually can't cross a firewall for security reasons. That is, incoming TCP connections to port 3306 are being blocked by the firewall or gateway onto the local LAN where mysqlserver.edu is.
The canonical test for this is:
$ telnet mysqlserver.edu 3306
I can predict that this will not work. ("Work" means that it reports "Connected to..." and outputs some gibberish.) You have several choices:
run the database locally, or at least nearby. I mean, it's not a LAMP stack unless it has MySQL. :-) This is what approximately everyone does.
use a tunnel / VPN solution of some kind to get through the firewall and to port 3306
open up 3306 on the firewall. You probably will not get cooperation on this.
Is "skip-name-resolve" option enabled in your my.cnf?