Hi @ramack,
Thank you for your quick reply. Here are some more details:
two things are created:
- The RESOL device, named “Resol KM2”
- The “Bridge VLANBus Adapter”
In the Resol device, I’ve manually configure it to use the “Bridge VLANBus Adapter”.
The IP address of the device is FIXED : 192.168.0.200
The 2 things are OFFLINE. The Device says it’s due to the adapter … Logic :') but on the “Bridge VLANBus Adapter”, there is communication error: “Server returned HTTP response code: 502 for URL: http://192.168.0.200:80/cgi-bin/get_resol_device_information”
I’ve manually tested this URL, and, indeed, not a valid one. The response is :
Bad Gateway
The process did not produce any response
A full nmap command on the device:
Initiating ARP Ping Scan at 10:49
Scanning 192.168.0.200 [1 port]
Completed ARP Ping Scan at 10:49, 0.31s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 10:49
Completed Parallel DNS resolution of 1 host. at 10:49, 0.01s elapsed
Initiating SYN Stealth Scan at 10:49
Scanning 192.168.0.200 [65535 ports]
Discovered open port 8080/tcp on 192.168.0.200
Discovered open port 443/tcp on 192.168.0.200
Discovered open port 53/tcp on 192.168.0.200
Discovered open port 80/tcp on 192.168.0.200
Discovered open port 22/tcp on 192.168.0.200
Discovered open port 1883/tcp on 192.168.0.200
Discovered open port 7053/tcp on 192.168.0.200
Discovered open port 57053/tcp on 192.168.0.200
Completed SYN Stealth Scan at 10:49, 8.97s elapsed (65535 total ports)
Initiating Service scan at 10:49
Result of the NMAP -p 7053 command:
PORT STATE SERVICE
7053/tcp open unknown
MAC Address: A8:40:41:18:FB:27 (Dragino Technology, Limited)
And indeed, the TELNET command is working.
So, my guess is that the requested URL is not working on the KM2 device and that the VBUSLan Adapter is bloquing on it 
Thank you for your help. Do you need additional information?
yann