RDC8445S repeated communication issues

Hello everyone,

I’m reaching out to the community for a technical perspective, as I’m facing a recurring issue and have not yet been able to identify the root cause.

Here is a clear summary of the situation:

1. I initially used a Ruida RDC6445G, which worked correctly for a period of time, but later developed serious communication problems with the PC.

2. After that, I purchased another Ruida RDC6445G from AliExpress.
   This unit never communicated with the laptop, regardless of the method used (LAN, USB, or WiFi).
   A dispute was opened and the controller was returned to the seller, but AliExpress closed the case without issuing a refund, based on their internal resolution process.
   The final outcome was that the controller was returned and the payment was lost.

3. Assuming this was an isolated incident, I recently purchased a Ruida RDC8445S from eBay, but I am now facing exactly the same communication issue.

What I have tested so far:

• two different laptops

• multiple versions of RDWorks

• LAN, USB, and WiFi connections

• basic wiring and system settings verification

The controller powers on, displays menus normally, and appears to function locally, but no software connection can be established (constant “Connection Failure”).

My questions for the community:

• are there any essential configuration steps that are easy to miss?

• have you encountered similar issues with RDC6445G or RDC8445S controllers?

• are there any known production batches with communication problems?

• could this be a firmware or hardware compatibility issue that is not immediately obvious?

I am not looking to assign blame. My goal is simply to understand whether this is a configuration issue, a compatibility limitation, or a hardware-related defect, before continuing with further testing or purchases.

Any feedback or shared experience would be greatly appreciated.

Thank you in advance!