Cannot log in to the MySQL server

Greetings!
I recently built a Ubuntu 15.10 Perfect Server with ISPConfig 3. Everything seems to be working fine but when I try to log into PHPMYADMIN I can't with root. I get an error "Cannot log in to the MySQL server" I know I am using the correct password. Any suggestions as to where I can look to fix this? Thanks

 

Looks like something to do with .. httpd_can_network_connect_db
Will this interfere with IPSConfig

 

FIXED!
I needed this:
echo "update user set plugin='' where User='root'; flush privileges;" | mysql --defaults-file=/etc/mysql/debian.cnf mysql

 

i had same problem.. what this command exactly makes??

 

So it is safe to use

 

'i'm getting error when executing this command..

 

Ubuntu 15.10 Perfect Server with ISPConfig 3.

 

till any suggestion?

 

SOLVED
1. service mysql stop
2. mysqld_safe --skip-grant-tables &
3. mysql -u root
4. mysql commands:
mysql> use mysql;
mysql> update user set password=PASSWORD("NEW-ROOT-PASSWORD-HERE") where User='root';
mysql> flush privileges;
mysql> quit
5. service mysql stop
6. service mysql start

Try to login using your new password:
7. mysql -u root -p

 

I got the same issue, thank you for resolving, it's working now.