I'm having problems with accessing the basic config wizard via spro, i'm also having the same issue trying to run "solman_setup" and "workcenter". For both issues i get "Internet Explore cannot open the webpage". The ITS is activated along with the ther services. If there's any settings that I"ve missed your help will be very much appreciated and please let me know if you need more information from me.
I suppose you are not having problems with the FQHN in other web screens, so DNS should be fine.
if this is a Microsoft Windows system I would try this workaround.
(*) One quick solution is to update the hosts file on each
work station. (Only an option for small installations.)
Add new line: 10.17.73.210 hostname.domain.ext
This must be done per workstation.