My configuration will not help you as I have a tailored setting to my devices 

just fo to advanced.  Betwork lLan.  And start adding ypur DHCP devices into the reaerved devices table one by one 

hope that helps 

have a great day

we dont have backup config we connected to TP-Link Cloud,

we add to reserver in dhcp the 2 client , and still error when try to disable the Traffic Monitor

system tools-->Traffic Monitor--->Traffic Monitor--> off

please advice we have more then 200 devices like this and we cannot use Traffic Monitor as it cannot be disable...

we login throw web with the admin username and password,

and we cannot disable it,

when the vr600 connected to the tp-link cloud there isnt backup option for configuration,

you can take vr 600, enable traffic monitor, try to disable and get the same error,

please advice

@Make_IT_Better 

Please try the following 

go to    advanced >>>> network >>>  internet >>>> disconnect the internet connection 

 then 

go to system tools >>>> traffic monitor >>>> disable 

then  

advanced >>>> network >>>  internet >>>>connect the internet connection   then 

this will work ,, please let me know if it does not 

cannot do that on remote! we have enable it without disconnect wan connection,

please fix it without the need to disconnect wan!!

its a bug, please release new fix firmware

@Make_IT_Better 

didnt get update on this issue,

please advice

I am also experiencing the "Error code: 9003" message, on a VR400 model though. I have found that connecting a Broadcom RM Mini3 (Black Bean/2737) device to the network causes the problem once "Wireless Networks" is clicked or similar functions that show a list of connected devices.

It's probably not a Broadcom fault and a firmware update to the VR400 model is unlikely, but this workaround worked for me.

1. Disconnect Broadcom device

2. Reboot router

3. Connect Broadcom device again

As you can see in the images below, before the above steps only 4/7 devices are shown due to the error.

If the problematic device is added last the problem doesn't appear to exist.

When the original error occurred, here are the POST requests that were made and the responses:

POST http://192.168.1.1/cgi?5
[1,0,0,0,0,0]0
[truncated]
hostName=RM3-42-a3-40


X_TP_ConnType=1
active=1
[error]9003


POST http://192.168.1.1/cgi?6
[1,1,0,0,0,0]0
enable=1
X_TP_Band=2.4GHz
[1,2,0,0,0,0]0
enable=1
X_TP_Band=5GHz
[error]0

@PulpImmersion we still waite to tp-link to respond on this, there isnt a fix for it,

also for the QOS that isnt really work as require.....

@Make_IT_Better 

Hello, what's the hardware version and firmware version of your Archer VR600?