Archive for November, 2009

Often, broken links can be organized into two categories: gone “permanently” and gone “temporarily”. Why is there this distinction at all? A broken link is a broken link – isn’t it?

A “permanent” broken link occurs when a domain name is completely inaccessible or has expired. The domain wasn’t renewed by the webmaster – abandoned only to be bought by spammers who now have the advantage of the site’s former Internet credibility. Other sites that have a link to that domain now have sent their users to the spammer’s site.

Obviously, it’s good practice to know when certain domains expire, especially your own. One of the more popular services is Go Daddy, who will monitor expiry date and domain information for a fee in return. This is good and bad: you might be a responsible and proactive webmaster, who renews in plenty of time, or you could be a spammer waiting to pounce.

If you find a domain inaccessible error, you should look for alternatives or cached content – refer to this LinkAider blog post for more information about how to deal with broken links.

“Temporary” broken links occur when sites go down for maintenance from time to time. Other sites experience network or software errors. In these cases, you’ll probably see a custom error message explaining what has happened. Twitter is the most obvious example of constant downtimes. Its infamous downtime has become the topic of Internet folklore and is a part of many jokes already. Furthermore, Twitter was the inspiration for funny projects like: istwitterdown.com (now defunct itself – how ironic!) August 2009 was rather tough for Twitter according to the chart from the pingdom monitoring service. Growing pains or maintenance can take a toll – but downtime on a social network is not as serious as downtime for your income-generating site. Although these days you may argue that Twitter now provides this type of service and should be making uptime guarantees like other hosting providers.

Hosting providers build contracts around guarantees for uptime. Typically, they are expressed using a percentage. Percentages put a context around the amount of time that a server/hardware/network is continually available (its availability). Percentages make the hosting contract look great at first sight. However, let’s do some math. If a hosting provider says:

• 90% uptime, it means the server may be down 876 hours a year
• 95% = 438 hours down
• 99% = 87 hours, 36 minutes
• 99.9% = 8 hours, 45 minutes, 36 seconds
• 99.99% = 52 minutes, 33.6 seconds
• 99.999% = 5 minutes, 15.36 seconds
• 99.9999% = 31.68 seconds

Of course, these are just network guarantees. Webmasters can also experience some downtime (on top of that) due to script mis-configuration, bad coding or human errors.

Also, when double checking and/or fixing your broken links manually, keep in mind that some websites may be inaccessible within a certain network location or country. So if you have some doubts, check services like these: downforeveryoneorjustme.com and dingitsup.com.

Downforeveryoneorjustme.com is a nice test to do when your users tell you that a site is down. You can check it online and then diagnose the problem – it might be their machine, not the server or the network.

Dingitsup.com sends a text message to let you know when a site is back up or has gone down. Be the first one to know if a site goes down before your end-users or customers start calling. The last thing you want to send out is a large email campaign and have a flood of complaints about a site that is unavailable.

In summary, if you have any doubts about a domain link, double-checking is always the safest route. If you’ve already signed up with LinkAider, you know that you can re-run your broken link report with a single click. If you haven’t signed up yet, consider doing it now. It’s free.