Explanation:

The Client address backtrace is the result of a network trace from the computer running the target database back to the computer running Foxhound. The value ::1 is the IPv6 equivalent of the IPv4 address 127.0.0.1 which is "localhost", which in turn means Foxhound is running on the same computer as the target database.

The IPv6 value ::1 may show up in the Client address backtrace value if your computer has IPv6 installed even if you are using IPv4 addresses.