Error message - Cannot open communication device

Our internet connectivity works fine but we get the message frequently. How can I get rid of this reoccuring problem?
Thanks,
Keith

try making a new network location.
system preferences-->network-->location-->edit locations
click the + sign, title your location with a name of your chooseing, click done and apply.
then from the list of network ports delete all the ports you dont use, such as bluetooth, firewire etc Then apply.
See if that fixes the issue.

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