WordPress Troubleshooting: WordPress Admin Area (Dashboard) Redirect Loop

Yesterday, I helped one of my clients with her WordPress-powered blogs. When I tried to find the solution — using search engines — I could not find any exact solution.
Problem overview
Okey, here's the problem: When I tried to login to WordPress — not, but self-hosted — I always got these errors:

Redirect Loop
The has stopped trying to retrieve the requested item. The site is redirecting the request in a way that will never complete.
The browser has stopped trying to retrieve the requested item. The site is redirecting the request in a way that will never complete.

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I'm not sure what caused this problem. I thought it was my browser (), but I got the same problem on other browsers.

Server problem? I don't think so. I have some WordPress installed on the same machine. Here are some technical data about my client's WordPress installation:

  • WordPress 2.5.1 — When I upgraded from the previous version, it worked without any problems.
  • should work, but it's not. I have same plugins installed and mine has more plugins.

Troubleshooting: Disabling plugins, cleared the cookies
Okey, I disabled all installed and active plugins. Because I couldn't get in to “Dashboard”, I downloaded all plugins, and remove them from server after that. You can disable plugins by moving all plugins (files and directory under “wp-contents/plugins” to other directory. It's the same.
I also cleared the cookies. If you're using Firefox, go to Tools > Options > and click on the “Show Cookies” button. Delete the domain cookies (if any). For Opera, go to Tools > Preferences > Advanced > Cookies. You can delete cookies from the corresponding domains from the dialog box. For , you can find it somewhere in “Internet Options”. :)
I tried to login again, and still got the problems. Is it because of the older version of WordPress? Probably. So, I took the risk by upgrading it to the latest version: WordPress 2.6.2.
Troubleshooting: WordPress
I just wanted to make sure that I had the database backed up. So, I created backup for the database, and uploaded the new files. It seems that I can directly upgraded my WordPress without going to Dashboard. Once you have your new files uploaded, just visit the Dashboard , or simply login to admin area from or After the upgrade, everything was back to normal. Great!
The first thing I did after that was to re-upload the previous installed plugins and updated the out-dated plugins. When I went to plugin management page, I got a warning message:

The plugin ../../wp-content/themes/theme_directory_name/header.old has been deactivated due to an : Invalid plugin.

Okey, there was an error because the themes needed a plugin that did not exist. Luckily, the was not active (being used). I simply removed it, and the warning message disappeared. After that, everything worked without any problems. Problems solved. Great!

3 replies on “WordPress Troubleshooting: WordPress Admin Area (Dashboard) Redirect Loop”

I have a question that I cannot seem to find an answer for.
What I want to do is be able to pass a parameter (a flash file name) to a blog page. This blog page contains a swf player that will then play that flash file. Is this an easy thing to do? If so, I am lost would appreciate any help.
Thank you in advance.