When you are not able to connect after changing network adapter settings, there is last recovery option:

• disconnect power supply of converter
• remove three screws on both sides of case
• connect power supply and ethernet cable, configure network adpater of your PC to IP address 192.168.0.xxx
• two short presses on button showed on picture
• converter will temporarily switch to base IP address 192.168.0.202
• on your web browser go to http://192.168.0.202
• fix network settings
• test new settings
• disconnect power supply
• mount case