This is a bit vague but maybe it will be helpful...
When I try to install the Apache Directory Studio plug-ins on top of
Eclipse 3.6 I sometimes get a "Service Unavailable" error which breaks
the installation process. Other times I get a dialog asking me to trust
the certificate on the download server. If I get the dialog about the
certificate then everything works.
Usually I try to install the plug-ins many times until it works.
Using Eclipse downloaded from www.eclipse.org on Fedora 13 with Sun's JDK.
Let me know if I should fill in with more details.
Warm regards,
Jon Kristensen