MySQL Client does not support authentication protocol

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 4.0, 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.

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This entry was posted on Sunday, February 3rd, 2008 and is filed under Mysql, Tips n Trik.

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One Response to “MySQL Client does not support authentication protocol”

1
KattyBlackyard
June 15th, 2009 12:09

Hi, very nice post. I have been wonder’n bout this issue,so thanks for posting

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