ERROR: Cookies are blocked or not supported by your browser. You must enable cookies to use WordPress

In my case it was a plugin which I installed yesterday night.
In the next day I got this error.
SOLUTION : Deleted the plugin from wp-content/plugins and every thing was OK after that.

Related Posts:

  1. COOKIE_DOMAIN setting confusion
  2. Security in WordPress plugin development
  3. Trying to migrate a WordPress Multisite with Domain Mapping
  4. Getting an ERROR: Cookies are blocked error when logging in to a site on a different domain?
  5. Subdomain login problems
  6. How to fix blocked cookies error that doesn’t let me log into wp-admin?
  7. Cookie signed verification failed – wp-saving-post
  8. Login problems on multisite installation with different domains
  9. Error : Cookies are blocked or not supported by your browser
  10. How do I stop exactly one blog from network ever setting cookies?
  11. Is there something I need to know in order to use WordPress on foreign (Swedish) TLDs?
  12. Multisite cookies are being shared across domains unwanted
  13. How can I create network with different domains?
  14. Remember language choice on multisite website
  15. Single sign on to sub-sites in Multisite Network
  16. How to login a user with wp_set_auth_cookie on a specific blog within a multisite environment
  17. Cookies in Multisite network where sites have their own domain name?
  18. WordPress Network / Multisite login to one site allow access to all
  19. WordPress MU: Cookie error when trying to login on network WP instance
  20. Moving a WP Multisite to a subdirectory
  21. Restrict Admin Capabilities in MultiSite
  22. How to add super admin to all sites
  23. How do I query all posts of one type across my multisite installation?
  24. Multisite 404 errors and non-www redirecting to home page
  25. Multisite non-www domain redirects to sign-up
  26. Multisite with entirely different domains?
  27. Testing Multisites with vagrant or Can I use multisite with only an IP address (without domain name)
  28. Using “/blog” as a site with WordPress Multi-Site
  29. Can you set up a wordpress (multi-site) network to work across multiple hosting accounts?
  30. No Network/Super admin after enabling Network
  31. Creating a Post form outside of the Admin
  32. How can I create a multisite global tag cloud?
  33. Possible to create a multisite network where the main site is non-WP?
  34. Override database config for WordPress multisite
  35. ‘Remote Login’ with MultiSite Domain Mapping still forcing users to login to all blogs individually?
  36. Change multi-site installation from sub-domains to sub-directories
  37. Multisite on Rackspace Cloud (ubuntu lucid)
  38. how could I have a user signing up for a blog, be assigned to that blog only
  39. Multiple WP Sites Same Server – Share WP Base?
  40. Super admin access to a forgotten WP instance?
  41. How to search users globally on a multisite install?
  42. Auto Redirect after login
  43. Upload images from one site to another in Multisite
  44. Multisite: copy template when a subsite is created
  45. Iframe being removed only for some users when publishing a page
  46. Start with multi-site feature now or later?
  47. Adding new sites to Multisite won’t register in Dashboard
  48. ‘Cheatin’ uh?’ Error When Attempting to Upload Images After 3.4 Update
  49. How to get permalink using get_blog_post function in a multisite?
  50. Multisite gives Error if i want to enter Dashboard or Site
  51. Blocks Rest API rest_cannot_delete
  52. htaccess file for multiple CMS’s (multisite wordpress + wolfcms) on same domain but different subdirectories
  53. Multisite with different domain names on different servers
  54. Good way to block users within a multisite setup without deleting them?
  55. Redirect One Multisite to Another
  56. Multisite Installation is all the same site
  57. Some doubts related to Multi Installation → Media of one of the site can be used on the others?
  58. Multisite Posting Recent Items in All the Sites Linked with Multisite
  59. single sign on for wordpress multi site
  60. How can you override the is_multisite check in wp-login.php for individual login/registration?
  61. Navigation menu not being assigned Theme Location
  62. Moving wp-admin folder to a different host in a multisite environment
  63. Issue with Multisite and SSL
  64. Custom port problem with local MU installation
  65. List recent 25 blogs across the network
  66. What does multi-site WordPress application mean?
  67. Add wordpress multi sites with different port number from 80
  68. Create website with a switch between private and business [closed]
  69. Can’t create a subdomain network – and WP is installed in webroot, not a folder
  70. How to make my third multisite blog start with id 1000?
  71. Forward and mask a WordPress website
  72. Filter meta request
  73. Is this a good case for Multisite?
  74. WP Multisite – How to create a custom “router” for blog prefixes?
  75. Does switch_to_blog support array or other ways to show all posts on a network install?
  76. How to make subdomain and muti-site but wordpress isn’t in root?
  77. Show buddypress profile fields in a multsite blog [closed]
  78. Add www to the Root Site in WP Multisite Network
  79. Multisite problem with unexisting paths to CSS etc
  80. How to disable Gutenberg editor from Multisite Admin panel?
  81. Multisite wp-admin redirecting to main wp-admin using NGINX
  82. How to allow mixed case characters in multisite site name?
  83. Separated Theme file on multi site network in subdomain
  84. Send data from one WP instance to another and process it there
  85. User not staying logged into one of sub sites in multisite after SSL
  86. register_setting() for single site vs update_site_option() for mu
  87. Allow users to register on multisite through WooCommerce using the same email address
  88. How To Change the URL of a WordPress Multisite
  89. Sending SMTP mail using a server with self-signed SSL
  90. Can WordPress Multisite work like a regular site?
  91. Site w/ Addon Domain doesn’t show CSS
  92. WordPress MU – Creating a site takes ages
  93. Default sub-pages on WordPress Multisite
  94. WordPress Multisite – Questions about select all posts from all network sites
  95. Comment reporting for Multisite
  96. How to display the most popular posts of all the blogs in a mu setup? [duplicate]
  97. WordPress MS wp-admin/includes/post.php error with shortcode generator
  98. Subdomain add comment redirect to 404 not found page iis server
  99. All links to images are broken in a subdomain multi site environment
  100. Multisite Login Access Restrictions