Eclipse help won't show under Ubuntu

Question

Whenever I open some help within eclipse I get a page saying:

Server Error. The following error occurred: [code=CANT_CONNECT_LOOPBACK] Cannot connect

Answer 1

Basically, this error means that Eclipse is failing to establish a TCP/IP connection to your localhost using 127.0.0.1 (Eclipse starts a server for the Help).

If you are using some specific proxy settings (either global at the OS level or local at the Eclipse level), double check that you are bypassing the proxy for localhost and 127.0.0.1.

If this doesn't help, try setting the hostname that help uses to localhost when starting eclipse (either on the command line or in the eclipse.ini):

eclipse -vmargs -Dserver_host=localhost