Here's the official word from MySQL: "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. If you upgrade the server from 4.1, attempts to connect to it with an older client may fail with the following message: shell> mysql Client does not support authentication protocol requested by server; consider upgrading MySQL client To solve this problem, you should use one of the following approaches: * Upgrade all client programs to use a 4.1.1 or newer client library. * When connecting to the server with a pre-4.1 client program, use an account that still has a pre-4.1-style password. * Reset the password to pre-4.1 style for each user that needs to use a pre-4.1 client program. This can be done using the SET PASSWORD statement and the OLD_PASSWORD() function: mysql> SET PASSWORD FOR -> 'some_user'@'some_host' = OLD_PASSWORD('newpwd'); Alternatively, use UPDATE and FLUSH PRIVILEGES: mysql> UPDATE mysql.user SET Password = OLD_PASSWORD('newpwd') -> WHERE Host = 'some_host' AND User = 'some_user'; mysql> FLUSH PRIVILEGES; Substitute the password you want to use for “newpwd” in the preceding examples. MySQL cannot tell you what the original password was, so you'll need to pick a new one. * Tell the server to use the older password hashing algorithm: 1. Start mysqld with the --old-passwords option. 2. Assign an old-format password to each account that has had its password updated to the longer 4.1 format. You can identify these accounts with the following query: mysql> SELECT Host, User, Password FROM mysql.user -> WHERE LENGTH(Password) > 16; For each account record displayed by the query, use the Host and User values and assign a password using the OLD_PASSWORD() function and either SET PASSWORD or UPDATE, as described earlier." HTH. Stephen Stephon McCray said:

Could someone please help me to understand what's going on and how I can fix it.

Running a XP professional SP2 machine with MySQL 5 and Apache 2.0.55 and the latest version of Active Perl. [Tue Nov 29 17:41:58 2005] [error] [client 127.0.0.1] Premature end of script headers: mainpage.pl[Tue Nov 29 17:41:58 2005] [error] [client 127.0.0.1] DBI connect('blank224:localhost','koha',...) failed: Client does not support authentication protocol requested by server; consider upgrading MySQL client at c:/usr/koha224/intranet/modules/C4/Context.pm line 411[Tue Nov 29 17:41:58 2005] [error] [client 127.0.0.1] Can't call method "prepare" on an undefined value at c:/usr/koha224/intranet/modules/C4/Koha.pm line 326.Also:[Tue Nov 29 17:41:41 2005] [error] [client 127.0.0.1] Premature end of script headers: opac-main.pl[Tue Nov 29 17:41:41 2005] [error] [client 127.0.0.1] DBI connect('blank224:localhost','koha',...) failed: Client does not support authentication protocol requested by server; consider upgrading MySQL client at c:/usr/koha224/intranet/modules/C4/Context.pm line 411Thanks,Stephon McCrayIT DirectorWestern Academy Charter School _______________________________________________

-- Stephen Hedges Skemotah Solutions, USA www.skemotah.com -- shedges@skemotah.com