Unable to access port through IPv6

[FC8E]

I have deployed a private cloud disk service on my Buntu touch device, which opens port 5212 and uses supervisord as a process guardian. When accessing the device port through internal IPv4, everything is normal, but when accessing through public IPv6 address, it returns a 502 Bad Gateway. But after pinging the IPv6 address of the device and attempting to access it again, it worked normally. May I ask if there are any good solutions available？

[arubislander]

@FC8E Difficult to say without further info:

1. what device are you using?
2. what version of UT (xenial/focal)?
3. how did you install your private cloud disk service?
4. how did you configure IPv6?