if you need to update your servers.ini you can get one at <a href="htttp://www.mirc.co.uk/servers.ini" target="_blank">htttp://www.mirc.co.uk/servers.ini</a> Just save it to your mIRC directory, replacing the old file
As for the ones you tried to connect to not working, it could be for a few reasons. The servers could be down or no longer linked, the network could be having problems, or you could be having a dns issue and need to connect to the ip rather than domain name. The best place to find an up to date list of servers for a network is to check their website for a list and then add them to your servers.ini (click on ADD under view--options-->connect-->servers). Sites like www.searchirc.com
are helpful as well.