The configuration file now needs a secret passphrase (blowfish_secret).

updated phpmyadmin addon update blowfish configuration · centminmod/phpmyadmin@ff5a042 · GitHub with new blowfish configuration steps

so for you can manually do this using these commands in SSH as root user

Code:

cd /usr/local/nginx/html/pathtoyourphpmyadmininstall
BLOWFISH=$(openssl rand 30 -base64)
sed -i "s|\['blowfish_secret'\] = ''|\['blowfish_secret'\] = '${BLOWFISH}'|g" config.inc.php

then re-login into phpmyamdin

 

it will be located in main hostname's web root off of /usr/local/nginx/html/* you can check phpmyadmin install log in /root/centminlogs/ for the initial phpmyadmin addon install outputted info again to find your path which is same path used to log in via https i.e. yourhostname/pathtomyadmininstall = /usr/local/nginx/html/pathtomyadmininstall