How to set external url for code collaborator to host name instead of 127.0.0.1:8080

Hello,

I have just finished setting-up a trial version of latest collaborator version on windows 2012 r2 with SQL db.

In the "requested url" field, the value coming is http://127.0.0.1:8080/go?page=SystemDump.

I want to change it to hostname.com.I tried changing it through External URL: option, however, it is not happening. In fact, on clicking hostname.com, it is opening IIS.

Can anyone please guide me on the same?

Thanks,

Nishant