How can I check if my site is working properly?
If you want to test that your site is working properly (particularly if you see some sort of unusual problem and you want to see if it’s just caused by an issue on your computer), you might want to try these independent, third-party sites.
Instant site checks
If you have a blog, Is my blog working? gives you more blog-specific details. (If you see a message saying "Your blog application doesn’t support gzip compression", you can enable compression, preferably with the WP Super Cache WordPress plugin.)
Detailed technical tests
We use many of the tools in this section to independently check sites on our own servers (in addition to our own monitoring tools).
WebPageTest shows extremely detailed performance characteristics of your site. (After viewing the results, you might be interested in our pages explaining how to increase browser caching and enable compression.) The Pingdom Website Speed Test and GTmetrix test are similar.
Load Impact allows you to test how much your site slows down when 50 people visit it at once.
If you want to check the DNS settings for your domain name, intoDNS is a great resource we often use ourselves. DNSValidation, squish.net DNS checker, and ZoneMaster are similar. What’s My DNS? can query multiple DNS servers around the world.
If your site uses an SSL certificate, SSLShopper offers an SSL certificate check. Qualys SSL Labs offers a more detailed technical SSL test. (It’s normal not to get a perfect 100 on this test, but it should be at least an “A-”. You can improve your rating by disabling SSLv3.) High-Tech Bridge has a similar test, and SSL-Tools can be used to verify that a site isn’t vulnerable to certain SSL security problems.
You can check some technical details of the HTTP headers sent by a URL on your site using redbot.org.
Ongoing monitoring services
Services like SiteUptime can check your site for problems at regular intervals.
E-mail blacklist checks
Our spam filtering system uses “blacklists” (among other things) to check whether mail from a certain IP address should be allowed. The Anti-Abuse Project has a page you can use to check any IP address to see if it’s on any blacklists. You can also check the email sending reputation of your domain name on the widely-used Barracuda Reputation system.
You can check for problems with your mail by sending a test message to mail-tester.com.
Web browser appearance checks
If you want to see what your site looks like in many different Web browsers, Browsershots offers a free service that takes lots of screen shots and displays the results.
Testing your own Internet connection
ICSI Netalyzr can run a wide variety of more technical tests to pinpoint performance and security issues.