Defensive Computing

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December 29, 2007 10:43 AM PST

Defensive Computing Cheat Sheet

by Michael Horowitz
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Since this blog went live in July 2007, there have been over 70 postings. For my all but mandatory end of the year review, below is a cheat sheet to the postings to date. I maintain a full blog index on my personal web site.

2007 Individual Postings

Prepare for networking failures by reading the lights on your router July

The pros and cons of LEDs for backlighting LCD screens July

Ask Leo Notenboom your computer questions July

Be careful when downloading software August

Task Manager in Windows XP August

Scan a suspicious file with 29 anti-virus programs August

What makes a good surge protector September

Create a second Windows userid for backup September

Why Apple isn't selling for Macs September

A new approach to securing USB flash drives September

Is Linux right for your mother? October

One Web site, many names: an introduction to domain forwarding October

Disgracefully unreliable software October

Why Java can't do addition correctly October

Avoiding new software November

60 Minutes on TJX computer security November

Be careful when shopping for a replacement laptop battery December

Sweet spot in monitors December

Antimalware software suites December

Am I the real John Hodgman? (the only humorous posting all year) December

IE6 crashes in Windows XP: fixing the fix December

Get Spyware Doctor for free - a first look at the Starter Edition December

2007 Topics With Multiple Postings

RAID Level Zero

Don't get burned by RAID Zero July
Following up on RAID Level Zero July

The Mozy online backup service

Everybody likes Mozy--except me Part 1 July
Everybody likes Mozy--except me Part 2 July

DropMyRights

Every Windows XP user should drop their rights August
DropMyRights part 2: Installing and configuring August
DropMyRights part 3: Living with it August
Restricting insecure applications November

E-mail

Backing up e-mail August
Thunderbird August
A new e-mail scam August
Portable Thunderbird September
Defending against a phishing email message October
Test your email program October
Is that e-mail message legit? How a computer nerd analyzes it November

Second Guessing Walter Mossberg

Wall Street Journal Readers - check this out September
Debunking Walter Mossberg - better PC buying advice October
Improving on Walter Mossberg's PC-buying advice November
Parsing disk-partitioning advice December

Windows XP vs. Vista

I pity the fool (Windows XP good, Vista bad) September
When to convert from Windows XP to Vista, Part 2 September
Putting Windows Vista on trial October
More FUD for Windows Vista November
IBM Recommends Windows XP December
Windows Vista gripes from Lenovo December

Amazon's MP3 Download Store

Amazon's MP3 Download store--a book report September
Defensively shopping at amazon.com October

Microsoft Updates Your Computer Whenever They Feel Like It

Windows is Spyware September
Defending yourself against Microsoft September

Sending Files Too Big To E-mail

Sending big files with SendThisFile November
Transferring big files with EatLime, SendThisFile, and FTP November
Transferring big files with DropSend and TransferBigFiles December

Dealing With Software Crashes

Dealing with software crashes - Part 1 November
Dealing with software crashes - Part 2 November

The System Restore feature of Windows XP

Four Tips to Using System Restore on Windows XP July
No restore point for you December

Bugs in the Flash Player

Update your copy of the Flash player now. And do it right December
Problems updating the Flash player in Firefox? Here's Help December

OpenDNS

OpenDNS provides added safety for free December
More about OpenDNS, including adult site filtering December

Stalker

Finally, avoid reading comments by tenc21. He, she or they were stalking me, doing nothing but griping about anything and everything I say. All the comments made by this CNET user were on this blog, no others. They may appear to be on the topic at hand, but in reality, the purpose of these comments is not to debate anything just to argue. The comments are personal in nature, but thinly disguised as being technical.

See a summary of all my Defensive Computing postings.

July 11, 2007 10:32 AM PDT

The blinking lights on a router are talking to you

by Michael Horowitz
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Can't get on the Internet? Can't print to network printer? It's bound to happen sooner or later. Wired Ethernet networks are pretty reliable, wireless ones can be brutally finicky. But no matter what type you're using, it's good to be prepared for networking failures in the future.

When there is a networking problem, the knee jerk reaction may be that there is something wrong with the computer. Perfectly understandable.

But the first step in debugging a networking problem should not involve any of the computers. Rather, you should look at the lights on the box(es) sitting at the hub of the network. The hardware is talking to you and may have something useful to say.

The box(es) may be a number of things. Often there is a broadband modem (cable or DSL) and a separate router. There may even be a third box for VOIP to which a normal telephone is connected. On the other hand, all these functions may be combined in a single box. The advice is the same either way.

Before trouble strikes look at the box(es) holding your network together and make a note of the normal state of every light while the network is functioning properly. Is the light on or off? Green or Amber? Solid or blinking?

So that it's always at hand, I suggest keeping this cheat sheet right next to the device in question. Maybe even tape it to the box, so it can't get lost. Now, when the network fails, the first thing to check is the lights on the box(es).

That's step one. Step two is to examine each box and make a note of the vendor and model number. Then go online to learn what every light can tell you. It's one thing to know that a certain light is normally green, but exactly what does it mean when the light is amber? Or blinking green instead of solid green?

I try to find the manual for the device at the web site of the hardware manufacturer. In addition, I try to find documentation on the lights at the website of the broadband provider. Cable and DSL modems can be modified by an ISP, so their documentation may be more accurate than that from the hardware manufacturer.

If you were given a manual/booklet/pamphlet with the device and can still find it, great. But this would be my last choice for information as it may not be up to date, may cover multiple models or may not reflect customizations made by the ISP.

If, at your ISP's web site, you can't find anything documenting the meaning of each light, then contact your ISP and ask them. Someday, you may be very thankful you did.

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About Defensive Computing

Michael Horowitz is an independent computer consultant and the author of several classes on Defensive Computing. He views Defensive Computing as taking steps, when things are running well, to avoid or minimize the inevitable problems down the road. It's about educating yourself to the level where you can make your own intelligent decisions about keeping your computers and data happy and healthy. If you depend on computers, yet are on your own, without an IT department or nearby nerd, this blog's for you. His personal web site is michaelhorowitz.com.

He is a member of the CNET Blog Network and is not an employee of CNET.

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