It could happen when developing with Websphere Studio Application Development that you bang into the error operation timed out: connect. Generally this happens when you have an XML file with a remote dtd.
There some way to solve this. The first is to get an internet connection. Maybe the problem is because you are behind a proxy. If so, in windows->preferences for the internet voice, set the proxy parameters.
Another solution is to change the XML file pointing to a local copy of the DTD file. However this solution, in my opinion is the worst. It’s not portable: when releasing the application you have to change the source or you force the production environment to a physical disk structure. If you have more than one user you force every user to have the same disk structure.
What I prefer to do is switching to the resource view, create a local simple project with the required DTDs inside of it (1), going to window->preferences->xml->xml catalog (2), select the new button and add a new catalog item, specifying with the browse button select the local file from the workspace as URI and as key the remote address in the source file (3)(4)(5).