MySQL error token mismatch when you connect to a database in PHPMyadmin.
if the browser cookies don’t match the error: token mismatch comes up
Reasons that generate this error:
1. the /tmp directory is full. Run the command df -h on a server terminal, empty the directory contents when you find Use: 100% and clear the /tmp folder too.
2. Incorrect permissions: he permissions of the folder /tmp must be set to 755. Run chmod 755 /home/username/tmp
3. php.ini file issue: uncomment session.save_path and set the value to /tmp.
ession.save_path = "/tmp"
restart apache: service httpd restart
4. Outdated browser cache: clear the browser cache and cookies.