Hi,  @ccb_tisalete 

Thank you for posting on our business forum.

To help us better pinpoint your issue, we would like to kindly ask you to confirm the following information:

1. The whole topology of your network
2. Are you using a Controller to manage your devices? If yes, please provide the specific type and version of your Controller
3.Full details of your mDNS-related configuration
4.Does the access rule you mentioned refer to the ACL you have configured? Have you tested the same setup on other devices to check if normal access can be achieved?
Thank you very much for your kind cooperation.

Hi,  @ccb_tisalete 
Thank you for your reply。

It appears there may be some ambiguity in our understanding resulting from translation, so we would like to confirm the following additional details with you:

1.We need your complete network topology, including all relevant devices and their corresponding model numbers.
2.3.We would like to clarify whether you are using a controller (e.g. OC200, Software Controller) to manage your devices, as this information was not mentioned in your original post.
Regarding the access rule you mentioned earlier, could you please specify your specific access rule configuration and provide relevant screenshots if possible?
Thank you very much for your kind cooperation.