I have the address placed as such: <a href="irc://irc.servername.com/#server" target="_blank">irc://irc.servername.com/#server</a>

And the link works. Everyone else who clicks on the link gets mIRC to pop up and directly connect to the channel named. Yet when I click on the link, either nothing happens, or the following appears:

The page cannot be displayed
The page you are looking for might have been removed or had its name changed.

What can I do to make it so that mIRC pop up after clicking on the link?