DNS customized port number not working. it is working only port 53. why I can't use another port?

[ChiY119]

I have my DNS server.
My DNS server is using the customized port(not default 53, it is using 99).
I want to connect my android app to this dns server.
App is not working with this port number.
I hope you reply to me
thanks

[PeratX]

You should enable Advanced DNS in Settings

[ChiY119]

I did Advanced DNS(enabled).
In this case, I think, it seems to work on any port number.
I tried port53 and any other port number.
Both case, everything worked.
what is the reason?
my dns server is not working on dns port 53.
But if I enable Advanced Setting, with port 53, it is working.
could you explain to me?
thanks

[PeratX]

Without Advanced DNS, Daedalus is using system's DNS mechanism, which means the system will handle DNS requests automatically.
With Advanced DNS, Daedalus will filter all DNS requests and handle it manually, which support all ports and different protocols.

[ChiY119]

My dns server is running on port 99.

I tried to check in both case with Advanced DNS.
1 - my dns ip : 53
2 - my dns ip : 99

I think, in first case , android phone should not be worked domain function.
But for both case, all is working.
any idea?
thanks for your replying

[PeratX]

You can see detailed DNS request log in Log fragment.
Please check it and upload it then we can have a nice discussion.

[ChiY119]

I will upload screenshot.
And one question :

Inside only my app, I can use my dns server(dns server port 99)?
Android is possible?