If you're running a DA server, recently updated mysql to version 5.1, you'll still need your old libmysqlclient.so files from mysql 5.0.
This would be the error you're seeing:
[root@server directadmin]# service directadmin restart Stopping DirectAdmin: [FAILED] Starting DirectAdmin: /usr/local/directadmin/directadmin: error while loading shared libraries: libmysqlclient.so.15: cannot open shared object file: No such file or directory [FAILED]
To resolve the issue, simply grab the old libmysqlclient.so.15 file from our server.
Example, for CentOS 5 - 64-bit, run:
wget -O /usr/lib64/libmysqlclient.so.15 http://files.directadmin.com/services/es_5.0_64/libmysqlclient.so.15 chmod 755 /usr/lib64/libmysqlclient.so.15 ldconfig
On non-64-bit systems, the file would go into /usr/lib/libmysqlclient.so.15