Upgrade MySQL server

I recently had to upgrade a mysql server from version 4.0.x to 5.0.x and ran into the following issues.

#1 Error Client does not support authentication protocol

This was due to the fact that the mysql client was older than 4.1 and the server was upgraded to 5.0.x and according to the MySQL documentation: MySQL 5.0 uses an authentication protocol based on a password hashing algorithm that is incompatible with that used by older (pre-4.1) clients.

You can either upgrade the mysql client to a version 4.1 or greater or run the following for the user name that needs to connect with a mysql client version of 4.0 or less.

    -> 'some_user'@'some_host' = OLD_PASSWORD('newpwd');

In addition, you may need to edit your mysql server 
to accept old password. You can do this in the /etc/my.cnf 
file by adding old-password = 1 to the [mysqld] section and
restarting mysql.

#2 DNS issues. I was getting an error that the username couldn't
connect from a particular hostname.  To take DNS queries out of the
connection, you can add skip-name-resolution to the [mysqld] section
of your /etc/my.cnf file and this will tell mysql server daemon to 
not perform a DNS lookup of the calling IP address. Restart mysql.

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