Did you try to use mudfish v4.6.1 which found at Index of /releases/ link? Recently I found that GWF (Great Wall Firewall) blocks the mudfish IP and domains. So it’s the reason why it doesn’t work.
To solve this issue:
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First you should bypass the DNS poisoning by GWF. You can try to use Mudfish DNS Client to encrypt DNS traffics. Or other methods such as DNS over HTTPS.
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Then you should use at least mudfish v5.0.9 because it includes some code modification to fix this issue.