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http://servername:6080/arcgis/rest/services/xxx/xxx/MapServer?token=xxx
works fine and I am directed to the service information without a need to login
however
when using the mapped (external DNS record) reference, it gets to the ArcGIS REST login page
http://xxx.com.au/arcgis/rest/services/xxx/xxx/MapServer?token=xxx
Like Dan mentioned in his comment, how and where are you generating your token?
I ran into a similar issue with some REST API scripting. I had generated my token at http://localhost:6080/arcgis/admin/generateToken with the Client parameter set to Request IP. When I would try and access secured services programmatically using my public URL and token (much like you are doing), I would get an error for invalid token.
What I had to do was generate my token from the REST admin at the public URL (http://domain.com/arcgis/admin/generateToken), using Request IP, then my token was valid when used in conjunction with the public URL.
