Fresh Install, after a couple of abortive attempts. I am now at the OES
configuration screens. I have left all ports and such default, filled
in the relevant data.

When I hit the next button, after doig a lot of stuff, it fails.
Looking at the log, I find two things of interest:

Failed to configure http service, service already exists, error -606

SAS Failed to configure unknown error -1260

This server will be running GMS, if it makes any difference.