How can I fix the MediaWiki error “Wiki uses cookies to log in users. You have cookies disabled. Please enable them and try again.”?

Question

The problem I am having is that I can not log on to my newly created wiki that I made using MediaWiki. I have searched the web for an answer, and the ones I found did not help w

Answer 1

same thing may happen when memcached is used to store session files. in this case wiki will be unable to write cookies neither in / neither in /tmp. if you see in error.log something like "file not found (11211:9001/qweqweqweqweqe)" this will mean, that you have memchached installed and configured and you need to append the following lines in LocalSettings.php:

$wgMainCacheType = CACHE_MEMCACHED; 
$wgParserCacheType = CACHE_MEMCACHED; # optional 
$wgMessageCacheType = CACHE_MEMCACHED; # optional 
$wgMemCachedServers = array( "127.0.0.1:11211" );
$wgSessionsInMemcached = true; # optional

Answer 2

Another thing to check is if your session tmp directory is full. Symptoms are "write failed" messages in your http server error log. Duh!

Answer 3

If you are using NGINX + PHP-FPM the previous answers will likely not solve your problem.

From my experience, this issue is caused when php-fpm doesn't have write access to the cookie_path. You can find this path by running:

php-fpm -i|grep --color cookie_path

See what your cookie_path is, then stat the folder and ensure your php-fpm user has write access to it.

To resolve this issue using Nginx and Php-Fpm, I had to change my cookie_path from it's default of / (seriously, why would this be a default?) to /tmp.

After restarting nginx and php-fpm, it works perfectly.

Answer 4

I also had this issue ...

All my browsers were complaining about cookies being turned off....

I thouhgt a group policy had been implemented to disable cookies. After conferring with my server support team that nothing as such had been implemented I decided to remote to the server.

The server was complaining about low disk space. I cleaned up the disk by deleting some old unrelated files.

Tried to logon again from my browser and all was Ok.

Answer 5

Put

$wgDisableCookieCheck = true;

in your LocalSettings.php.

(source)

Answer 6

One answer which hasn't been mentioned here - make sure your file system isn't out of space.