Tomcat Not Starting Through Eclipse (Timeout)

Question

I am trying to run Tomcat through Eclipse. This is something that I have done for the past several years. It was working yesterday and now it is not. The error I get is

Answer 1

A Java update caused the same problem (among others) for me. The update caused Eclipse to use ipv6 when pinging Tomcat and for some reason that doesn't work with my setup.

I fixed it by adding

-Djava.net.preferIPv4Stack=true

To eclipse.ini.