Backend response failed to parse as valid json

Backend response failed to parse as valid json
This is written after the authentication of my server

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I have this problem too. Windows 10.

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I’m having the same issue.

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Me too, however, the server is working, but very strong out of sync

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I also have this Error message on my Windows Server i dont have a clue what it could be

I have the same issue on windows 11 and on windows 7

[25/03/22 21:35:54.846] Heartbeat [ERROR] Backend response failed to parse as valid json
[25/03/22 21:35:54.846] Heartbeat [DEBUG] Response was: `-1`
[25/03/22 21:36:14.819] Heartbeat [DEBUG] heartbeat (after 30s)
[25/03/22 21:36:44.897] Heartbeat [DEBUG] heartbeat (after 30s)
[25/03/22 21:37:14.973] Heartbeat [DEBUG] heartbeat (after 30s)
[25/03/22 21:37:15.116] Heartbeat [ERROR] Backend response failed to parse as valid json
[25/03/22 21:37:15.116] Heartbeat [DEBUG] Response was: `<html>
<head><title>502 Bad Gateway</title></head>
<body>
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.19.7</center>
<script defer src="https://static.cloudflareinsights.com/beacon.min.js/v652eace1692a40cfa3763df669d7439c1639079717194" integrity="sha512-Gi7xpJR8tSkrpF7aordPZQlW2DLtzUlZcumS8dMQjwDHEnw9I7ZLyiOj/6tZStRBGtGgN6ceN6cMH8z7etPGlw==" data-cf-beacon='{"rayId":"6f1a71753d099196","version":"2021.12.0","r":1,"token":"f9a95c0b198345e9b299f6f462e59d22","si":100}' crossorigin="anonymous"></script>
</body>
</html>
`
[25/03/22 21:37:45.066] Heartbeat [DEBUG] heartbeat (after 30s)

So, i had this problem and just fixed it. When port forwarding, it’ll ask for internal and external ports (depending on service) if you happen to input non matching numbers this error will appear. make sure your external and internal are the exact same and try again.