I have installed piwik-3.x. It was working till yesterday. When i tried to login on piwik, it gives error (no config changes are done)
Error: Form security failed. Please reload the form and check that your cookies are enabled. If you use a proxy server, you must configure Piwik to accept the proxy header that forwards the Host header. Also, check that your Referrer header is sent correctly.
I have checked error logs, but found nothing in it.
I had also tried to access it on other browsers, but it’s not working.