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Thank you for a prompt response. I have identified the plugin causing the conflict.
Since that plugin is not essential, will delete it. Thanks again.

Thanks to both of you for your responses. I am using Blue Host, but it appears to have a similar setup to GoDaddy. If I am reading Blue Host documentation correctly, it limits available ports for shared IPs. If I pay extra for a dedicated IP, all ports are then open. Will try to adapt LesTexas60 GoDaddy solution to Blue Host before trying a dedicated IP.