Yesterday’s Thoughts

October 4, 2005

mysql_connect(): Client does not support authentication protocol requested by server; consider upgrading MySQL client

If you receive this error message, the answer to your question is here. Don’t go anywhere else.

After wading through substantial non-sense, Pat Hayzlett points out the answer here.

The problem in a nut shell is that mySQL 4.1 changed their password hashing and now store the passwords of database users in 40 chars instead of 16 as formerly. A number of clients cannot handle these wider passwords, including recent versions of php.

This is a public service announcement for the desperate. Normally Google is fairly effective at pointing out the solutions for very specific problems such as this, but it took a while for me to wade through the dross. If you are having this problem, follow the links. In the comments section at are instructions for modifying your php installation.

5 Comment(s)

  1. Paul | Nov 29, 2005 | Reply

    Thanks! This was very helpful!

  2. tincanman | Dec 28, 2005 | Reply

    Useful solution. I read the MySQL page just before coming here otherwise I’d be bowed down in effusive thank yous. It’s also a trap if you’re stuck developing in VC6 and are trying to bludgeon the MySQL++ library into your source code.

  3. Benjamin Juang | Jan 2, 2006 | Reply

    Thank you!

  4. BC | Mar 13, 2006 | Reply

    Excellent entry! This was so much more helpful that the 20000 other hits I got from google that didn’t help solve my problem!

  5. Sudar | Mar 19, 2006 | Reply

    Hi Ray,

    I was breaking my head for the past two days because of this error. I was trying to set up both phpMyAdmin and WordPress in my local system and was getting this error. I tried to change so many things and at last made it work after reading ur post through Google.

    Thank you very much.


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