Intermittent list of AD Trusted Domains when setting share permissions

[giox969]

We have 8 trusted AD domains in our production WAN. QNAP with firmware 4.3.3 is joined to our "master" domain, which has trusts with all the remiaining 7 domains.
The option "Enable trusted domains" in SMB Advanced Options is enabled.

When settings permission on a SMB share, we can only see an empty/incomplete/partial list of domains from which we can choose users from. Sometimes the list is empty, sometimes it only contains some domains.

domlist_empty.png

domlist_partial.png

I tested in a shell with wbinfo, but all seems to be ok

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wbinfo -m

correctly reports our 8 domains + BUILTIN and our QNAP hostname.

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wbinfo -u

correctly lists all user on our master domain

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wbinfo --domain TRUSTEDDOMAIN -u

correctly lists all user on all 7 domains (it's a bit slow, sometimes)

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wbinfo -i 'trusteddomain\user' 

correctly retrieve info for a user on a trusted domain

The problem seems to be related to the web UI only.

How can I add users of trusted domains to my share permissions if they are not listed in that dropdown list?

Thank you

[cryogenx]

Im having the exact same issue and along with it terribly slow permissions apply speed, some of my folders have taken in upwards of 8 hours to apply permissions, seriously considering replacing these devices with something else