HTML/CSS/JavaScript Reference Sites

November 24th, 2012 Comments off
Categories: Useful Links, Web Development Tags:

Nagios Error “HTTP WARNING: HTTP/1.1 403 Forbidden”

May 18th, 2011 2 comments

When monitoring websites with Nagios, it’s common to get the error “HTTP WARNING: HTTP/1.1 403 Forbidden“.

Quick Solution

Use the -H option to specify the host name for the web site e.g.

define service{
	use                     generic-service
	service_description     HTTP
	check_command           check_http!-H
Categories: Computers Tags:

Fixing Extra Newlines in Text Files

September 11th, 2010 Comments off

When editing source code you often come across files with additional blank lines that shouldn’t be there.

Extra blank lines

The problem is generally caused by someone editing the file with a text editor which doesn’t understand and maintain the different newline types. You then end up with a file containing a mix of different line endings. Read more…

Categories: Programming Tags:

Password Salting Techniques

August 9th, 2009 3 comments

This article is about using salting techniques to improve the security of authentication for websites.  Examples are in PHP but the techniques apply to any language. Read more…

Categories: Computers, Security, Web Development Tags:

Missing tooltips in Firefox 3.5 and IE8

July 5th, 2009 2 comments

I’ve just upgraded to Firefox 3.5 and noticed that tooltips had stopped working.  I then checked Internet Explorer 8 and found tooltips were not working there either.

On investigation it seems that the two problems were unrelated, but here are the solutions to both of them… Read more…

Categories: Computers Tags:

Run SysInternals tools direct from the web

January 22nd, 2009 Comments off

SysInternals tools are a fantastic set of free utilities written by Mark Russinovich and Bryce Cogswell.  There are invaluable for system admins and Windows Power Users.
There is now a website that allows you to run most of the SysInternals tools directly, so you don’t have to find the right page, download it and unzip.  You just run it directly from:<tool>.exe


This works better in Internet Explorer than Firefox, since you can run the tool without saving it first.

Categories: Computers, Windows Tags:

DOS Equivalent of GREP

September 22nd, 2008 Comments off

In Unix you can pipe the output of a command into the GREP command in order to only display the lines that contain a required string.  This is means you don’t have to scroll through pages of output to find the bit you’re interested in.  The DOS equivalent of GREP is FIND:

Searches for a text string in a file or files.

FIND [/V] [/C] [/N] [/I] [/OFF[LINE]] "string" [[drive:][path]filename[ ...]]

/V         Displays all lines NOT containing the specified string.
/C         Displays only the count of lines containing the string.
/N         Displays line numbers with the displayed lines.
/I         Ignores the case of characters when searching for the string.
/OFF[LINE] Do not skip files with offline attribute set.
"string"   Specifies the text string to find.
Specifies a file or files to search.

If a path is not specified, FIND searches the text typed at the prompt
or piped from another command.

this can be useful with the netstat command:

netstat -ano | find /i ":80"

or when viewing the DNS cache:

ipconfig /displaydns | find /i "google"

Although that isn’t ideal since the output of ipconfig isn’t really formatted to play nicely with the find command.


Categories: Computers, Windows Tags:

Windows XP DNS Cache

August 27th, 2008 Comments off

Windows caches DNS responses to speed up network access, but sometimes this can cause a problem.  Positive responses (i.e. successful lookups) are cached for 24 hours, and negative responses (i.e. failed lookups) for 5 minutes.

If you make changes to DNS and want to test the results straight away, you need to clear the cache with:

ipconfig /flushdns

You can view the current cache with:

ipconfig /displaydns


ipconfig /displaydns | more

to see a screen at a time

Categories: Computers, Windows Tags:

Misc iPhone Tips

July 21st, 2008 Comments off

Slow Response, especially in Contacts or Text

Some suggestions from around the web:

  1. It is probably caused by memory leaks in 3rd party apps.  You can close any app by holding Home button for 6 seconds.
  2. iPhone 3G was released with firmware 5a345 but iTunes 7.7 contains firmware 5a347.  Do a restore from iTunes to get the newer version. Make sure you have synced and backed up before doing this, since you are completely wiping the iPhone.  Lots of people are saying that helps.
  3. Rebooting the phone – hold power button for several seconds, it will ask you to slide to turn off.  Hold power button to turn it back on.  This is the same as rebooting any computer – you’re cleaning up the memory.

Battery Life

To extend the battry life, switch off WiFi, 3G and Bluetooth when you’re no using them. Hopefully someone will soon write a utility to do this easily and quickly from one place. I may even give it a go myself…

Categories: iPhone Tags:

Take screenshot on iPhone 2.0

July 21st, 2008 Comments off
  1. Hold Home button
  2. Press Lock button

The screen will flash and image will be saved to Camera Roll

Categories: iPhone Tags: