Try this Javascript test link, which I found on a different KEE support page:
https://forum.kee.pm/t/troubleshooting/560
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"Check if your network hosts file is correctly configured to send localhost traffic to your local 127.0.0.1 IP address
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If you’re still stuck and want to gather some more information to help you or someone else diagnose the problem, you could try running this JSFiddle to test if your web browser is able to connect to KeePass: Edit fiddle - JSFiddle - Code Playground"