Last month the undersea cable SEA-ME-WE 4 cable was cut near Egypt causing a massive degradation of internet speed in India. For me several websites including the world’s 6th popular website Wikipedia didn’t load at all. And to make matters worse I wasn’t able to access my own blog :'( as it was located in Dallas (so traffic had to pass through damaged cable). So I quickly setup VPN server on an AWS micro instance running Linux (Ubuntu) and accessed everything I wanted, so here I am writing this article for the benefit of all netizens. To create a similar type of VPN server in windows read this tutorial. You’ll find a lot of articles on the internet with the similar topic but in this article I’ll keep the configuration part as short as possible setting up only the bare minimum to get a PPTP VPN server running in the time it takes to make noodles!Continue Reading…
Fix serial port permission denied errors on Linux
The ancient serial port which is no longer found on the latest motherboards and even the not so latest laptops is still used for connecting to the console of networking devices, headless computers and a lot other applications. On computers which do not have built-in serial ports USB-to-Serial adapters can be used. Linux identifies inbuilt serial ports as /dev/ttyS0, /dev/ttyS1,….. /dev/ttySn and USB-to-Serial adapters as /dev/ttyUSB0, …. /dev/ttyUSBn and they can be accessed using terminal emulator applications like PuTTY, minicom and screen.Continue Reading…
apc.php Download
PHP APC (Alternative PHP Cache) is a framework which speeds up PHP applications by storing the result of compiled PHP programs in the memory a.k.a. caching. The apc.php file is available in the APC package if downloaded as source from the APC page of the PECL website, but if you have installed it from the Linux repository by using the command yum install php-apc or apt-get install php-apc this file will not be available. I have extracted the apc.php file from the APC source downloaded from the PECL website and it is available for download here.
Download apc.php (12KB)
Extract this file and upload it to your document root, access it from your browser and you will see a page similar to the following.Continue Reading…
Username availability check with AJAX and PHP
Recently the AJAX bug bit me and I started rewriting the code of htdigest generator, htpasswd generator and URL encoder/decoder after learning some basics from w3schools.com. I tried creating a username availability validator using AJAX and it worked well so I am here writing this article on how to do this. I will be concentrating more on the AJAX part and less on PHP because I have already written an article on how to connect PHP and MySQL. In the end of this article there is a link to a demo which I created, it has a HTML form sans form tags 😛 just to demonstrate username validation.Continue Reading…
Fix the client intended to send too large body nginx error
I recently encountered this error on this WordPress installation running on nginx webserver. I tried to upload a file of size 1.14MB for the article download vmnetcfg.exe when WordPress displayed “HTTP error” in red. I thought it was a problem with either PHP’s max_execution_time or max_upload_filesize directives, but modifying them did not solve the problem. Taking a look at the PHP error log I couldn’t find anything helpful. Finally I saw nginx’s error log which contained this error.Continue Reading…
Installing phpMyAdmin behind Varnish
Recently I chanced upon installing phpMyAdmin on a Linux server running nginx as a backend and Varnish as a reverse proxy. I faced a few problems which took hours of googling to solve so here I am writing this article to make your life easier. This article assumes you already have a web server up and running along with PHP, MySQL and have configured Varnish as a reverse proxy. Most of the problems I faced are because I already had wordpress running on that server, so I had configured Varnish to accept cookies from ONLY “(wp-admin|wp-login)” URLs this turned out to be a disaster for phpMyAdmin even after I configured a “return(pass)” for its URL.Continue Reading…
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