Hi,

Last week when I installed SER on Debian, I encounterd the same problem. The MySQl manual gives you a couple of courses of actions:

See http://downloads.mysql.com/docs/refman-4.1-en.a4.pdf section A.2.3

------------------------------------------------------------ A.2.3. Client does not support authentication protocol

MySQL 4.1 and up uses an authentication protocol based on a password hashing algorithm that is incompatible with that used by older clients. If you upgrade the server to 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:

1 Upgrade all client programs to use a 4.1.1 or newer client library.

2 When connecting to the server with a pre-4.1 client program, use an account that still has a pre-4.1-style password.

**3 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');

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. ------------------------------------------------------------

The actions marked with ** above is what I did and after restarting MySQl it worked fine.

cheers, Jan

=========================================================== Hi again, Thank you for your quick answer. Here is my error log output.

Serweb [error] file:/usr/home/dev/serweb-0.9.4/html/data_layer.php:465 DB Error: connect failed - [native code = Client does not support authentication protocol requested by server; consider upgrading MySQL client] ** mysql://ser:heslo@localhost/ser

When i read MySQL Reference Manual i see that, MySQL changed its password style in 4.1 or newer versions. (in Serweb install manual it writes MySQL 4.0, i didn't think that it could be a problem and installed 4.1.13)

What do you advice me to do?

Gokay