How to fix connection fail?

How do you fix a "Connection Failed" error when trying to connect to my iMac?  My iMac can see the MacBook Pro just fine but when I try to connect the Pro to the iMac I get a "Connection Failed" error.  Clicking on "Connect As" gives me the option to select "Guest", "Registered User", or "Using an Apple ID" -- none of which will work.  Can anyone help?
Thanks.

A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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