Resolved Different HSTS status with www. and .com domains

[Dukemaster]

Hi,
since a few days I have in different output on Qualys SSL Labs between domains with www. plus ending .eu, .de and domains with www. together with .com.
When I make tests for all domains on HTTP/2 Test | A simple HTTP/2.0 test tool I get the result HSTS plus ALPN activated!
When I test the domains on ssllabs. all domains without www. have grade A+.
But domains with ending .eu and .de testing together with www. get only grade A and blue box HSTS is on detail site not visible.
But the .com domains have grade A+ no matter if I test them with .www or without .www.
It seems crazy, but it's like a rule.
I have 3 .eu domains, 2 .de, and 4 .com domains on the server. All have the same IPv4 and IPv6, except one .com domain which has a dedicated IPv4, but the same IPv6 like the others.
What is wrong?
Ubuntu 16.04, Plesk 17.5.3, Apache (event) with Nginx as proxy which serve static files, PHP 7.1.4 with FPM over Apache. MySQL 5.7

Greets

 

[UFHH01]

Hi Dukemaster,

pls. note, that your issue/error/problem/question is absolutely not related to any Plesk product or component. For non-Plesk - related issues/errors/problems/questions, we have the "OPEN TOPICS" - forum:

=> Home > Forum > General Discussion > Open Topics​

In addition, you provide informations with screenshots from Qualys SSL Labs, which will never ever lead to possible investigations. (Sub)Domain - specific vhosts - configuration - files could help here to investigate your desribed issue and the related questions. I still don't want to miss to inform you, that IF you use the very same vhosts - configuration, you should consider to ask for support at the Qualys SSL Labs - Community forum, in order to get help for your issue :

=> SSL Labs | Qualys Community​

 

[Dukemaster]

Thanks a lot for the advice @UFHH01 but sorry I'm no moderator nor admin of Plesk Community so I'm not able to move the thread to another location. But before investigating further I'm fully satisfied that between the lines you told me that it seems nothing to do with Plesk. That's enough for the moment.
Lots of greets and a happy holiday to everyone.