Not able to connect to external webserver when Running Mendix app in the cloud

I am using Mendix as a front end to a webserver installed on AWS in our own account. I can connect to this webserver when I run Mendix locally but when I uploaded my App to Run in the cloud, after that I am not able to connect.  To simplify the access, I changed the AWS instance inbound rules to accept any HTTP request over port 80. This used to work in March 2020 but the same does not work now. Not sure if anything changed on the Mendix side when connecting to external webservers when using the developer version of Studio Pro?  
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