ERROR
Getting following error after downgrading MySQL Version to 4.0 [on cPanel VPS server]
[root@vps ~]# mysql
ERROR 2002: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
SOLUTION
Edited "/usr/share/mysql/charsets/Index" and add the following line at the end:
cp1251 83
After adding the above lines MySQL starts working fine.
[root@vps ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1 to server version: 4.0.27-standard

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> \q
Bye
[root@vps ~]#
Enjoy