fixed.
NOTE! I CONSIDER THAT WHAT HAPPENED MUST BE A BUG, PLEASE READ MY POST CAREFULLY AND TELL ME IF THIS IS WORKING AS INTENDED OR IF IT WILL BE INVESTIGATED AS BUG
Ok, so... a little recap on what happened and what my config is.
1) my subscription plan sais that "prefered domain = www.domain.tld"
2) i install wordpress app to the domain. regardless if i chose default options or if i click on customized options, the installer puts wordpress into
http://domain.tld (
THIS IS WHAT I CONSIDER WRONG, MORE ON IT LATER)
3) i click on wordpress app and Administrative interface OR i go manually to the website. i get ERR_TOO_MANY_REDIRECTS
THIS IS WHY:
plesk is redirecting my web to
www.domain.tld and wordpress is redirecting it to
http://domain.tld this causes an infinite loop
THIS IS THE (TEMPORAL) FIX (i say TEMPORAL coz i consider this should be fixed by parallels):
A) go into plesk panel, to the subscription, unlink it and configure "prefered domain = nothing"
B) the wordpress now is accesible. log into it and go to settings. change the two URL settings and add the www.
C) back to plesk panel, you can now use "prefered domain = www.domain.tld" and sync the subscription again
WHAT IS EXPECTED:
what i expect is that when the subscription has "prefered domain = www.domain.tld", that the wordpress app installer uses that for the URLs, and not
http://domain.tld
If I can't get an answer on this here, I'll make a new post out of it as it's now a bugreport.