You may need to contact your systems administrator if the firewall is part of the local area network your computer is attached to. The specific ports that need to be opened are:
If access to the Internet is through a proxy server, you need to configure the proxy settings by going to the "Preferences" menu entry (Edit/Preferences in the Views window) and selecting the "Proxy Configuration" tab.
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Port Mode Protocol Description of service 4447 Output TCP Connect to most CmapServers 443 Output TCP Connect for IHMC Public Cmaps(1), (2) & (3), IHMC Cmappers 80 Output TCP Connect for IHMC Cmap Cloud 4747 Output TCP,UDP Connect to the Directory of Places to get the list of CmapServers 4747 Input UDP Broadcast discovery of Places located on the LAN 4999 Output TCP CmapTools' WebSearch Server 5001 Output TCP WordNet Server 8001 Output TCP Web server of the CmapServer (Place) 31099 Output TCP Communication with the Index Server. Used by the CmapTools' Search.