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On a Unix system supporting IPv6, PuTTY will by default create listening sockets (e.g. for the local end of a local-to-remote tunnel) as IPv6-only. Attempts to connect to the port using IPv4 addresses (127.0.0.1) will fail, and often the same problem will occur with the name "localhost". This occurs for instance on Ubuntu Linux (so this is probably what's behind LP #67488).
This contradicts the documentation of the default "Auto" setting for tunnels, which states that "ticking 'Auto' should always give you a port which you can connect to using either protocol."
Unix PuTTY should ensure that listening sockets are valid for at least the address families specified in the configuration.
Audit trail for this bug.