Fully Qualified Domain Name, example below
my domain name is UKTrading.co.uk
my server name is SQLServer1
The FQDN for the server is SQLServer1.UKTrading.co.uk
To connect to this server in a mirror session using port 5022 i would use
TCP://SQLServer1.UKTrading.co.uk:5022
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"Ya can't make an omelette without breaking just a few eggs" 😉