Nothing JBoss Tools specific here - just eclipse P2 (update manager) complaining.
Looks like
eclipse.org servers are not reachable for you or are simply down.
if it still happens I would report at
bugs.eclipse.org for 1) improve this situation that
seem to happen often and p2 needs to be better at tellinga bout it 2) see if
eclipse.org
can fix their servers ...
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