Author Archives: Derek Carr (zaphinath)
IPC – Linux Communication Signals
IPC – Inter-process Communication – is the way running programs can communicate with each other in a Linux system when there are conflicts or user has need to interrupt the running program. The following are a list of the various signals that the Linux Kernel handles. Most of us are familiar with several of them […]
Computer Systems – Going down the rabbit hole.
If you are looking to understand linux and how the overal picture works with the kernel down to the hardware a great book to use is Computer Systems: A Programer’s Perspective. The thing I really liked about this book is it first walks you through how the processor is set up and gives a great […]
HTTP Error – 500 Internal Server Error
Description The 500 Internal Server Error is a “catch-all” server error and the server cannot be more specific about the nature of the error. The causes for a 500 error can be any number of things and about 9/10 times the error comes from a code error, which means that the problem is not necessarily […]
All You Need to Know About php.ini
Description Most servers with php installed on them come with default settings that are used server wide. However, sometimes a program will require these php settings to be changed and instead of changing the settings for the entire server a person can overwrite the default settings for just a particular location (or domain). This is […]
HTTP Error – 404 Not Found
Description A 404 Not Found means the address cannot find a file or folder on the webhosting server or the server has not found a file matching the given URI. Troubleshooting to Fix Check the spelling for the file and URL. After the base url all the links are case sensitive according to the casing […]
HTTP Error – 402 Payment Required
Description Reserved error for future use. The original intention was that this code might be used as part of some form of digital cash or micropayment scheme. This code is not usually used, however, Apple’s MobileMe service generates a 402 error (“httpStatusCode:402” in the Mac OS X Console log) if the MobileMe account is delinquent. […]
HTTP Error – 401 Authorization Required
Description The website you are trying to access has a password protected page. A 401 – Authorization Required error usually means either you do not have not been given the right username-password combination or the basic authentication failed. Troubleshooting to Fix Have you been given a username and password for this location? Usually if you have […]
HTTP Error – 400 Bad Request
Description This error 400 – Bad Request simply means either there is an error in the way you tried to type the website into your browser or your browser and web server where the site is hosted are having problems communicating with each other. Most often 400 – Bad Request is due to a bad […]
HTTP Error Codes
Description While on the internet every person has seen error codes. There are a wide variety of error codes and reasons for them. This article will simply address a list of common HTTP error codes and link to subsequent articles with more details about the error codes, common causes, and how to fix the reason […]