Magento Admin login kicks me out back to the Admin login

问题

After I enter my username and password and click "Login" it sends me back to the Login page with NO error messages. The URL changes to include a session key and that's it. Everytime I click Login again, the session key is regenerated and I still can't log into the admin interface.

回答1:

I just encountered this problem on one of my servers (not a localhost installation). Turns out the system account was over quota, so I presume Magento was unable to create the necessary temporary files. (I noticed this when trying to create a directory on the server over ssh.)

So... maybe check to make sure the account under which Magento is running isn't over quota on your server? At the very least, it might not be a Magento problem directly.

回答2:

Clear the contents of the directory var/cache and try again.

If that doesn't help check the table core_config_data in the database for records with a path value of "web/secure/base_url", "web/unsecure/base_url" and "admin/url/custom". These should match the page you are trying to log into (but without "index.php/admin/" at the end)

Finally check your browser's cookie settings and that the server's PHP is able to set cookies.

回答3:

I was having the same problem running Magento 1.5.1 on my production server. I would log in to the admin, the url would show the address for the dashboard (with the secure key), but the screen would still be the login screen. There was no error. This happened with FF, Safari, and Chrome.

I fixed it by manually setting two core_config_data values in the database. They are as follows:

web/cookie/cookie_path = /

web/cookie/cookie_domain = "mydomain.com"

clear out var/cache and try to log in. For me, it worked.

回答4:

Version 1.7.0.2 I have been moving my magento store from on server to another one, and I had the same problem. Use phpamdin to edit your database on new server, search for web/cookie/cookie_domain in 'config path row', the value is probably your old domain name: yourdomain.com, change that to your new domain name OR to your new IP address (new server). If you attend to use your old domain on new server environment you will probably want to set your story ready before you switch your name servers. That was the case for me, after I added my new server IP to web/cookie/cookie_domain instead of domain I was finally able to log into my magento backend.

回答5:

I had some problems when on a local server. It was on http://server/username/ and so didn't have dots in it. If we changed the settings to be the IP address of the server then it was fine.

回答6:

There can be several things that cause this behavior. This is my checklist. One of them will eventually fix it.

1. Click the "forgot password link" and then the "back" link. This will remove any possibly misplaced params in the URL as well as make sure you're on the right server (some installations have separate admin servers)
2. Clear cookies or use an incognito window
3. Try another browser
4. Local installations: Try using 127.0.0.1 instead of localhost (and update the base URL in the core_config_data table)
5. Clear Magento cache, full_page_cache, and session directories in the magento/var/ directory (and repeat 1 and 2)
6. Truncate the core_session table
7. Verify your Magento has correct memory settings
8. Check Magento system.log and exception.log files and debug
9. Check PHP's error logs and debug

回答7:

I've experienced this issue using Opera, while in other browsers it worked fine.

Also, make sure to set correct cookie options in: System > Configuration > Web > Cookie Settings

回答8:

Also, make sure that your system time / time zone on the server and php and magento match up.

来源：https://stackoverflow.com/questions/4036384/magento-admin-login-kicks-me-out-back-to-the-admin-login