Communication error when validating API code

HI,
I am getting a communication error message when I submit my API code. I have read the “problem solving” tip to add
&force-check=1

to the URL.
No luck.

This is the error message I am getting.
Could not establish connection. For assistance, please start by reviewing our article on troubleshooting connection issues.

Hello There,

Thanks for writing in! Have you check out our knowledge base article already on how to resolve validation connection issues? You can check it here: https://theme.co/apex/forum/t/troubleshooting-validation-connection-issues/201

You might want to consult your hosting provider and ensure that all connection to Theme.co is allowed to be able to connect with out server.

Please let us know how it goes.