If you are unable to access a site, keep trying. Not all legal research can be conducted solely over the Internet. I believe that in order to write a brief on a current issue of law, the information needed is available from various proprietary sources. This includes most states' case law and includes citation checking. Citation checking is also available over the Internet.
Case law is available on CD-ROM sets.
Providers of these sets are state-specific, so check your local bar journal for advertisements. The providers then update the CD's by mailing a new CD set every 2-3 months. You might think that you could then use an older CD, recognizing that it would not contain the most recent cases, but software designers write in a code that makes the CD inoperable after a certain date. I firmly believe that the practice of law will have changed substantially ten years from now, based upon computer use. Practicing from home will become a viable and efficient method of serving clients, especially for solo practitioners.