If you user reverse proxy, check it.
even you got this error after install plugin
I am using a light speed with a WordPress Performance Improvement plug-in.
Even the performance enhancements are turned off even jet packs.
Even after changing and checking 5 minutes later, it was displayed as failed, so I gave up and created a topic.
But after 3 or 4 hours, I checked and it was changed to Passed.
I should have waited more than 5 minutes after changing the settings.
I thought that passed was displayed when lightspeed was able to connect to memcached.
I thought litespeed was simply checking the memcached connection and getting passed.
So I thought it would change to passed within seconds.
I don’t know why, but surprisingly, when I checked it this morning, it was changed to passed.
