Hi all,
I encountered this problem before; some setting in the security.policy file is incorrect for Mendix versions from 5.16.1 onwards at least until Mendix 6. This issue was fixed by Mendix for all applications running on Mendix cloud infrastructure. See my forumpost and Jouke's answer on adding the proper 'allow':
https://forum.mendixcloud.com/link/questions/9217
Now I am encountering this exact same problem with a Mendix application running on Mendix 5.21.4 as an on-premise installation. Does anybody now where exactly to correct this for an on-premise installation?
Thanks!