I’m trying to install MediaWiki myself and during installation I get the error
“Attempting to connect to database server as u70306923...success. Connected to 4.1.12; You are using MySQL 4.1 server, but PHP is linked to old client libraries; if you have trouble with authentication, see http://dev.mysql.com/doc/mysql/en/old-client.html for help.”
Since this is shared hosting, I don’t have any control over the php and mysql versions. I contacted netfirms and they’re not very helpful.
Any ideas on what I could do to overcome this and install MediaWiki?
To go on what betsy said: You need to contact your host since you don't have control over their servers. They need to install the MySQL-client 4.1 libraries to their web servers, recompile PHP to use the new libraries, and enable "old-passwords" in their my.cnf for their MySQL server.
This issue is kind of serious since every website on the same server as you will be experiencing the SAME issues (unable to connect) with the same error.