Before investigting firewalls, make sure that your local handle server is actually running.

By default it should be listening on port 800 (but check in config.dct), so run:
netstat -tln | grep 8000


Regards,
~~helix84

Compulsory reading: DSpace Mailing List Etiquette
https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette