cannot login/connect Cura to Ultimaker Account

[physi]

Application Version

4.9.0 and 4.8.0

Platform

Windows 10

Printer

Ender 3 Pro

Reproduction steps

Open Ultimaker cura,

Click on sign in

Website Login opens.
Enter credentials.

get redirected and this error

Actual results

Get an error SSL (see Screenshot) ,
this is from the logs:
2021-05-05 13:51:54,039 - INFO - [MainThread] cura.CuraApplication.writeToLog [596]: User accepted the User-Agreement. 2021-05-05 13:51:58,636 - DEBUG - [MainThread] cura.OAuth2.AuthorizationService.startAuthorizationFlow [161]: Starting new OAuth2 flow... 2021-05-05 13:51:58,638 - DEBUG - [MainThread] cura.OAuth2.LocalAuthorizationServer.start [63]: Starting local web server to handle authorization callback on port 32118 2021-05-05 13:52:04,787 - DEBUG - [MainThread] cura.AutoSave._onTimeout [59]: Autosaving preferences, instances and profiles 2021-05-05 13:52:13,772 - DEBUG - [MainThread] cura.OAuth2.AuthorizationService.startAuthorizationFlow [161]: Starting new OAuth2 flow... 2021-05-05 13:55:20,755 - DEBUG - [MainThread] cura.OAuth2.AuthorizationService.startAuthorizationFlow [161]: Starting new OAuth2 flow...

Expected results

Login should work

Checklist of files to include

• Log file
• Project file

Additional information & file uploads

Tested with Virusscanner disabled and with and without VPN, to exclude any local router issues.

[physi]

Well I figured out, that this is a local problem.
To solve that, I had to open chrome://net-internals/#hsts
and delete localhost from hsts

[Ghostkeeper]

To communicate the log-in information to Cura, Cura sets up a local webserver temporarily listening to a specific port on connections from localhost. The website visits the localhost page with the required log-in information in its request data.

That's why a connection to localhost is required.