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While I encounter this problem in one of my WordPress websites, I checked the login status in my other WordPress websites. Interesting to know, I could easily login to other websites in the same browser without any error. So, I was clear that there is something, which makes this website different in terms of browser communication.
I had faced this login error for the first time. Therefore, I recall all events took place in last 24 hours related to this website. Actually, just a day before, I had reconfigure Cloud Flare page rule for this website to improve caching. Which led to today’s login failure with enabled cookies issue.
Since, I could identify the real problem; finding a solution was quite easy to follow. I had signed in to cloud flare account, set this website in development mode (It’s like disabling cloud flare) – Boom – I could easily login to my Dashboard.
After I successfully login to the website dashboard, I went back to cloud flare and disable development mode. One easy action solved problem without any messing up with the website installation.
We have brought this to your notice because while I faced this problem and search online for solution, there were some weird answers. Someone was suggested making changes in .htaccess file whereas other was saying make changes in wp-admin files.
However, this solution will work, if you are using the Cloud flare as a primary DNS network.