I've setup a couple of friends with UTV Internet recently (via Cinergi, who seem to be a reseller); one of them is also in Kildare. I've experienced two problems, solved as follows, for what it's worth:
Connection won't remain permanently online
Modem supplied was a BT Voyager wireless modem. Configuring this with the default wizard results in a "dial-on-demand" connection, which only brings up the PPPoE link when a local PC tries to connect to the Internet; not nice if you want to be able to connect back to home from outside.
The solution is to go through Advanced Setup / Internet (access password admin/admin) and then click the Edit icon to the right of the current connection details (it looks like a small pencil). Now click Next on each configuration screen until you get to a page where you choose between Always-On/Dial-on-demand/Manual connect; change it to Always-On, complete the wizard, and the connection should now remain up permanently.
Connection up but Internet not working
This happened last night (and maybe previously; I've been away for the last week). After some experimenting, the actual problem was that the UTV DNS server wasn't responding to requests. I could ping the DNS server (and other Internet hosts by numeric address) but DNS lookups wouldn't resolve.
I fixed it by modifying the DNS settings under Advanced Settings on the router to use Eircom's DNS servers:
Primary DNS - 213.94.190.194
Secondary DNS - 213.94.190.236
Not ideal, but got over the problem. (It's possible the issue was the DNS proxy in the router itself, and rebooting the router to make the above change fixed the problem; I'll know in a few days, if the problem re-appears.)
To the poster with the working email but broken web: this sounds like a similar DNS issue; the email client would have cached the IP address associated with the mail server when it initially pulled mail, and would continue using the cached version for successive mail polls; since the web browser would be trying to visit new domain names, it would fail.
A quick check for other users to see if this is the same problem: ping 159.134.237.6 and ping
www.google.com (separately); if the first one works and the second fails, then you have a DNS issue of some sort.