To easy fix you can change the my.cnf file and restart that should fix the issue, just follow the steps which mentioned below.
1: Log into your server as root with SSH
2: move to the /etc/ folder
3: open the my.cnf file for editing using nano or vim
4: locate the string for max_user_connections and change it to what you would like.
5: close out of your editor and save the file. Then restart mysql.