Use the below syntax from the Terminal window on a Macintosh computer running OS X 10.5 (Leopard) to clear the DNS cache for the computer.

dscacheutil -flushcache

You might need to flush the DNS cache if you know a DNS change has been made recently but your Mac is not showing the change. OS X does a good job of DNS caching but it may take longer than you want to wait to update a changed DNS setting and running the above command will solve your issue without having to reboot.

To turn on legacy support in Joomla 1.5 follow the below steps.

1. Joomla Admin:Login to the Joomla admin by visiting http://yourdomain.com/administrator
2. Open Plugin Manager:Click on Extensions in the top navigation and choose Plugin Manager from the drop down.
3. Enable System – Legacy:Now visit page 2 of the plugins and click the red X for System – Legacy which will enable this module that provides support for Joomla 1.0 extensions. You can verify you have turned the module on by verifying the red X is now a green check mark.

That’s it. You can now install extensions from the previous version tree of Joomla.