I've been playing Lotro for roughly 2 weeks now and haven't had any problems. I went to log in today a couple hours ago, but the launcher would not fully load and go to the login screen. At the top it just says "Getting data centers", and I've closed the launcher and restarted it many times and each time it gets stuck on "Getting data centers". I waited a few hours and tried it again, thinking it might just be a temporary issue, and it's still doing the same thing.
try restarting your modem\router leave them switched off for at least 30 seconds. at the same time power off your PC and leave the PC switched off untill you modem\router has powered back on and connected
once your pc has restarted open an administrator command prompt and type the following ipconfig /flushDNS [press enter]
leave the command prompt open and test lotro
if you still have the same problems type the following into the command prompt ping gls.lotro.com [press enter]
does this display a list of numbers or do you see an error?