@ErnstSl 

 

Could be both Ethernet cables with problems, could be hardware issue with second port of Main Deco. You'll need to run few more tests to narrow the issue.

 

 

You run Deco mesh in AP mode, so here is the test I suggest:

 

1. Find short Ethernet cable.

2. Power off and unplug Main Deco from the cable with which it is connected to the ISP Router.

3. Bring Main Deco closer to ISP Router if necessary, connect new short Ethernet cable from  Step 1 to free port of ISP Router and to Main Deco.

4. Power on Main Deco. If it is online and healthy, this is good Ethernet cable.

5. Take one of Satellite Deco, bring it to where Main Deco used to be, connect it to Ethernet cable Main Deco used to connect before that test and power on Satellite Deco. Expected result: Satellite Deco should report Ethernet backhaul.

 

If expected result is achieved, we can say with confidence both Ethernet cables are good as far as Deco concerned. Then, the next test:

 

1. Bring Main Deco to where it used to be, connect it to Ethernet cable it used to connect to, power it on, wait till it is online and healthy.

2. Unplug from ISP Router short Ethernet cable you used in first test. Connect that cable to second port of Main Deco and connect Satellite Deco to other side of that cable.

We know that this short Ethernet cable is good, you tested it with Deco, so expected result is for Satellite Deco to report Ethernet backhaul.

@Alexadre, thank you for your reply. I will give this a try tomorrow.. Just left home for a "quick" beer

  @Alexandre. 

 

Due to the lack of a propper networkcable (only handmade), I could not try your suggestions. Tomorrow I will collect a good one at work for trying.

  @Alexandre. 
 

Sorry for the delay in my answer. It has been a hectic two weeks. But I have done my homework. I attached a new network cable between the master and the slave. 
 

this was successfully. So I installed a complete new cable. The Deco towers kept being online ever since that moment. 
 

up until today. I plugged in the second cable to a switch. Almost instantly the slave tower went offline. Since I learned from you what to do, I connected a new cable between the slave tower and the switch. But it keeps going offline. It drives me crazy. 
 

any tips?

 

regards, Ernst

  @ErnstSl 

 

Sorry, I am out of ideas.

  @Alexandre. 
 

found it. It seems that my daughter thought it was a good idea to plug in a additional cable (both ends) 😱 in the same switch. 

 

Took them out and all works good again. 
 

regards

  @ErnstSl 

 

Thanks for coming back and telling how mystery was solved. 

 

Out of all probable causes that one was least expected.