While working with one hosting client we came across an issue where PHPmyadmin was blank

On checking logs on /usr/local/cpanel/logs/error_log we could see below error

root@hosonline  [~]# tail -n 10 /usr/local/cpanel/logs/error_log
Cpanel::Server::write_buffer(Cpanel::Server=HASH(0x4abf5d8), “HTTP/1.1 401 Access Denied\x{d}\x{a}Set-Cookie: cprelogin=no; HttpOnl”…) called at /usr/local/cpanel/Cpanel/Server.pm line 1132
Cpanel::Server::write_content_to_socket(Cpanel::Server=HASH(0x4abf5d8), IO::Socket::SSL=GLOB(0x4a9c208), 0, “HTTP/1.1 401 Access Denied\x{d}\x{a}Set-Cookie: cprelogin=no; HttpOnl”…, SCALAR(0x20f8ae8)) called at /usr/local/cpanel/Cpanel/Server.pm line 626
Cpanel::Server::badpass(Cpanel::Server=HASH(0x4abf5d8), __CPANEL_HIDDEN__, 1) called at cpsrvd.pl line 2997
cpanel::cpsrvd::badpass(__CPANEL_HIDDEN__, 1) called at cpsrvd.pl line 5278
cpanel::cpsrvd::handle_auth() called at cpsrvd.pl line 1222
cpanel::cpsrvd::handle_one_connection() called at cpsrvd.pl line 1073
cpanel::cpsrvd::script() called at cpsrvd.pl line 437
PHP Fatal error: Class ‘AuthenticationCpanel’ not found in /usr/local/cpanel/base/3rdparty/phpMyAdmin/libraries/common.inc.php on line 876
PHP Fatal error: Class ‘AuthenticationCpanel’ not found in /usr/local/cpanel/base/3rdparty/phpMyAdmin/libraries/common.inc.php on line 876
PHP Fatal error: Class ‘AuthenticationCpanel’ not found in /usr/local/cpanel/base/3rdparty/phpMyAdmin/libraries/common.inc.php on line 876

The issue was diagnosed to missing libraries

We resolved the issue using below command by upgrading PHPmyadmin

/usr/local/cpanel/bin/updatephpmyadmin –force

Now PHPmyadmin works like Charm 🙂