from a google search on this error:
"fetch/store fails immediately with a stack trace starting as follows:

ERROR [SwingWorker] 2005-06-28 18:16:28,748:
edu.gemini.oodb.OodbClientBase - Connection problem
java.net.SocketException: Invalid argument or cannot assign requested
address
...with several more lines...
This is a known problem with the Fedora Core 4 people. The FC4 installation notes suggest that users upgrade their JRE to the latest 1.5_04 distribution from Sun at http://java.sun.com. We've tested this and confirmed that it fixes the fetch/store problem. After additional testing, we will make a special FC4 version available on the Gemini ftp site."